ELECOM EX-G Trackball Mouse, 2.4GHz USB Wireless, Ergonomic Design, Thumb Control, Smooth Roller Ball, Optical Tracking, 6 Programmable Buttons, Tilt Scroll, Computer Mice for Laptop PC, Windows & Mac

Worth it!
Best track ball around. Just bought my 2nd one to use on 2nd computer

Good Size and Shape For Long Hours of Use.
I purchased this unit on the death of my previous Elecom EX-G Pro trackball, which lasted 3 months short of 4 years with 10+ hours of daily use. Considering the Logitech trackballs seem to maybe last 9 months that was a huge improvement. I decided to not get another PRO model because the main difference between the two models was Bluetooth connectivity that I didn’t use and a few extra buttons that I programmed but rarely used.The EX-G model is dimensionally smaller- only 3 1/2″ at the widest point which means it fits my palm perfectly. There are three large click buttons, for left and right click and then I have the third set to launch Mission Control on my Mac. The scroll wheel can be a clicked down and left/right for 3 additional buttons which I’ve set for pause/play and track forward/back. Your index finger rests next to two small buttons that default at forward/back for webpages and similar. There is a two position switch for pointer speed, 750dpi and 1500dpi. At a glance you can tell high/low by what color is seen on the switch, either black or red. There is also a red LED inside that blinks beneath the scroll wheel. Underneath you can select power usage from Low to High (the switch is off/low/high) tracking is supposedly less ‘precise’ in low power mode, but I see no difference. The red LED under the scroll wheel is also your low battery indicator.I do not use ELECOM’s Mouse Assistant application, rather I use SteerMouse by PlentyCom.jp which is a $20 app that lets you customize a number of random pointer devices. The ELECOM product several years ago was poor when I purchased the PRO model, so since I already purchased SteerMouse, I simply continue to use it.I appreciate that this uses normal AA batteries (1) rather than a sealed rechargeable. If this model is anything like the PRO, I expect with my 10+ hour daily usage to see a battery last about 2 months on Low Power and Low Resolution.The trackball is a thumb operated version, which I’ve become accustomed to over the years and is smooth. This is actually smoother than the PRO and the Logitech units. The rolling surfaces are the same ruby beads as the PRO model, and due to how dusty my environment is, they need to be cleaned daily.I’m hoping to get at least as long as life out of this as I did the PRO model, so we’ll see. Again, I didn’t purchase another PRO because I didn’t use the Bluetooth or two of the extra buttons ever so why waste the money on a model that sells for $20+ more. The fact that is smaller in dimensions with smooth edges rather than the sharp corners of the PRO are improvements.I am removing 1 star solely because of the ‘frustration free packaging’ which was a plastic blister pack dropped into a cardboard box. The box wasn’t sealed and had obviously been crushed a bit and in my package there was no AA battery (which the listing says is included) nor was there a manual, warranty card or any actual paperwork. I did find the manual online. Fun fact, ELECOM products are sold in vending machines in Japan.

autoscroll function is horrible.
Last update: Replaced this with a Kensington Pro Fit® Ergo Vertical Wireless Trackball. Much better mouse and is comfortable and fits the hand and no accidental button clicks.2nd update: I’m not real happy with this. The curvature of the mouse and the very light switches means needing to hold fingers up off the mouse and every time I relax my fingers it causes activating the switches… not good when that causes unwanted actions. I had to turn off the third finger button to help reduce that because every few seconds I would unintentionally cause it to activate. Perhaps if it was wider and supported the pinky finger it might help as well as a greater curvature side to side. As is it want to not have the third button finger in a relaxed normal curve of the fingers but tends to flatten out the fingers causing unwanted switch activation. Plus change out the switches for heavier duty ones that would require more pressure to activate them.Speaking of the switches… they tend to be wishy washy, you can depress the buttons in such a way during normal usage the switches doesn’t activate. If not depressing the button directly downward at the exact center the switch may not activate, you think you clicked on something but nothing happens. There is a slight sideways roll to the button and it seems can cause the switches to move sideways instead of downward. I can feel the difference when pressing on the buttons. All together it’s annoying and causes hand and finger fatigue quickly.On the other hand… the roller ball is very smooth and dpi is very good. Now if only I had a 3D printer I would use the internals of this (but replace the switches with heavy duty ones) and make my own mouse case for it.And like I mentioned before the software for it needs to have the auto scroll function removed and replaced with regular scroll that doesn’t keep scrolling on it’s own. I removed the software I downloaded from Elecom and if playing a game use the game’s key remap to set the mouse’s buttons.Update: After trying and trying to disable that auto scroll I finally removed the the software and the scroll works normally. But I did lose page up/down buttons. For me that’s not a big deal as I scroll mostly and seldom use the page up/down. In games where buttons can be assigned a function in the game all the buttons are recognized and can be assigned a function and Elecom’s software is not needed. Plus scroll works normally for zoom in/out and doesn’t run away. I’m tempted to rate this at 3 stars since in order to stop that auto scroll had to remove the software for it and lose button functions. But in a game with user assigning button functions it works very well… wanting me to give it 5 stars for use in a game. So I’ll stick with 4 stars.The scroll wheel after the first couple of clicks goes into auto scroll and scrolls a page up or down a long ways before stopping. If playing a game and need to zoom in or out it’s uncontrollable, have to scroll other direction to try to stop it but just as often will zoom completely in the other direction. This is something that really needs to be fixed so it will stop scrolling (or zooming) as soon as the scroll wheel is stopped. Make it so it scrolls/zooms only while the wheel is being moved would be a 100% improvement. I’ve tried to find a setting that would change that but doesn’t seem to be one.The ergonomics is it’s a little small for the hand, could be wider and longer, but is something that could get used to. I think it needs to support the hand better, I find that when my hand is relaxed the weight of my fingers will actuate the left/right/ring finger buttons with the ring finger being the worst one.The ball moves smoothly and as far as I can tell accurately. There isn’t a way to change the alignment of what is “up” on the ball as with logitec’s M570 but the “up” direction seems to be correct for my usage and wouldn’t have needed to be aligned anyways.The switches seems very light and will actuate with very little pressure. To me it seems too little and there are times it clicked on something and I could have sworn I never pushed the button. So almost just breath on it to make the main buttons actuate. (I did replace the M570s switches with heavy duty ones which does takes greater pressure to actuate the switches).The 1,500 dpi resolution is great. With having a system that is 4K res using the old M570 the 400 dpi was like using a standard def to input to a High def system. The M570 would skip over areas of the screen making it difficult to select items. This Elecom mouse doesn’t have that problem.All in all if the switches stand up to usage for gaming this is a great replacement for the logitec M570. If there were heavy duty replacement switches for this I would replace the switches it came with for switches that required more pressure to actuate.Wanting to give this mouse a good try out I had been playing games (Eve online and Forge of Empires) with it for over 12 hours and the ball movement has been very smooth. The run away auto scroll is a real hinderance. The light switches can be gotten used to.My only real complaint is the auto scroll function… get rid of that and it would be a 5 star product. Time will tell how well the switches hold up to use.

Viniendo de dos Logitech M570 seguidos, con sus habituales fallos en los botones, el cambio ha sido muy facil, Es ligerisimamente mas corto que el M570 pero muy comodo y manejable. Practicamente no hay diferencia en la postura de la mano respecto al Logitech. Muy utiles los botones adicionales. La precision es mejorable. En ese sentido daria un 10 al M570 y un 8 al ElecomP.d.: añado que le he puesto la bola del Logitech y la precision es ahora absoluta. Parece que el dibujo de la trama de la bola Logitech funciona mejor

For too long the only real option for a good thumb track ball mouse has been available from logitech and even they reduced their range over time, leaving just the wireless m570 as the only one. What is unfortunate is they also cheaped out on some of the components used too (probably due to lack of competition) which often causes them to develop a fault with the buttons/switches (often registering double clicks or not at all). It seems like a very common problem and more than just annoying! It makes them unusable! This is what happened to mine of course and repairing/fixing the issue meant having to replace the switches (too much hassle) or purchasing another, which again was likely to get the same fault after an unacceptable amount of time considering the price.For a long time I searched for alternatives but many seemed to suffer from poor design and other annoyances/lack of features. Finally I stumbled across this Elecom EX-G M-XT3DRBK (Careful of the stupid naming scheme, there are a few variants!) so order it, but thinking again, its likely it would not be what I had hoped. Thankfully I was totally wrong, its been excellent so far. Not only is it a good replacement from the m570, its better in just about every way. It has more buttons and functions and has not developed any fault even after continuous abuse. It also has a nicer feel than the m570, especially the finish quality and shape as well as the button clicks (specifically the back/forward). It makes the m570 feel cheap in comparison IMO.It has 3 buttons + scroller + scroller tilt clicks left/right/center as well as the normally back forward buttons, it also has a high and low speed switch (I use mostly high). All the functions work using the default plug and play drivers, except for 1 of the 3 main buttons, but using Elecoms own driver/software can over come this and also has the added benefit of assigning anything to any of the above functions, including gesture options! The only thing is misses is the precision option, but that can be selected in windows mouse option and you are good to go. Just search for ELECOM Mouse Assistant (global) to find the download.The only slight annoyance (cant call it a fault) I could find was the smoothness when new, but this seems to have improved with use and now feels much smoother than the m570 ever did. The name of the product is also a bit stupid, Elecom really need to sort out their naming scheme as its just confusing, still it does not take much away from the product itself, which I would not hesitate to highly recommend to any looking for good thumb tracker ball.I believe this to be the best thumb tracker ball currently available on the market.