ELECOM-Japan Brand- Trackball Mouse, Wired, Wireless, and Bluetooth, Advanced Responsiveness, 8 Mappable Buttons, DEFT PRO/Black/M-DPT1MRBK

I've had three of the Elecom trackballs, the smaller, wireless grey ball one, the HUGE and this one the Deft Pro.I sent the smaller one with the grey ball back as the static friction was so bad as to make it a nightmare to do any kind of fine pointer work with.Next up was the HUGE, same deal, horrible bearings, way too much static friction but shape of the trackball wasn't right for my hands. I did a bearing mod with it which made the static friction almost ok but still wasn't happy with it (looks like it should be perfect for big hands but oddly wasn't).I usually use a Kensington Slim Blade which is THE GOLD STANDARD of modern trackballs. Nothing comes close to this for low static friction and I mean nothing unless you're going to get the old skool and hard to find roller bearing balls like the CST or the DT255. Sadly the Kensington isn't quite right for gaming which is why I wanted the Elecoms. i.e. it has a proper scroll wheel as opposed to the slimblade which detects a rotation of the ball itself for scroll which issues false positives in some situations, like gaming... yes I use trackballs for gaming :)I thought I'd give Elecom a third chance. The ball itself is slightly smaller then the huge but is still big rnough to be precise. The size / curve of the ergonomic shell, I find to be better that the HUGE and there's the added advantage this this works with wireless dongle, bluetooth and wired connections so I can use it via USB on all my computers and also use it with my phone or iPad etc. Great.I believe there's software for configuring the buttons on Windows, I am using a Mac and have paid for SteerMouse which is cheap enough and allows for very useful things like button macros etc and profiles per device, as well as turning off pointer acceleration which is ESSENTIAL for playing FPS etc on Mac. I can't advise getting that software enough. It's Apple Silicon M1 native too.The combination of the Elecom and SteerMouse has been almost perfect for me playing on the Mac sadly the trackball, out of the box, is let down by the synthetic ruby bearings, again. I don't know why no other company than Kensington can't get the ruby rollers right (even non slimblade Kensingtons don't seem to be there). So... rather than send this back again I decided to void the warranty and take it apart. It's a fiddly job, took me about 20 minutes to strip is down to the point where I could replace the ruby bearings with zirconium ones. If you're going to do this make sure to wait for long enough to decide you're definitely happy with the trackball as you can't return the item once you've done this.However, IMHO, this trackball is unusable for fine pointer work without this mod. You can find 2.5mm zirconium ceramic bearings on eBay and places like that, they're not that expensive and come in small packs. They're the same size as the ones needed for the Elecom HUGE if you're in any doubt.I can't stress enough how much of a difference replacing the bearings makes. It's made such a difference. For example, if you're trying to do fine aiming in an FPS of you need to move pixel by pixel (say you're selecting from small text) you'll know what I am talking about, the ball "sticks" then releases when the force becomes enough to over come the friction which means the pointer makes a small jump.There is still some static friction after the bearing modification, more than the SlimBlade of out of the box but it's reduced enough to not not too big a problem any more and for that reason and that reason alone I am keeping the Deft Pro as every other aspect of this trackball is great. There's 8 independent click / function buttons (including the scroll wheel click) all easily accessible. There's a hardware DPI switch for setting to lower or higher DPI which is great. If you use SteerMouse on the mac you'll have total control over the button mappings and sensitivity.I have no idea why Elecom do not ship there with proper bearings from the factory. It's worth noting that the Kensington Slimblade uses a different type of plastic to seat the bearings in which seems to be much smoother than the standard plastic used by all other trackball manufacturers for the bearing cups.Anyway. Yes. This trackball is amazingly good value for money given the buttons, ergonomics, size. It's perfect... IF you're happy modding the bearings. If you're not you're going to be constantly pulling the ball out to clear the bearings and getting annoyed if you need to do any small, fine pointer work.Again these are my opinions. I own and have owned a wide variety of trackballs. I still have a couple of CSTs, a Kensington Slimblade and the mythical DT255, and a Perixx PERIMICE-720 (which I think is excellent out of the box, but it's a thumb ball which is useless to be for gaming etc however has little static friction) as well as having owned most of the other Elecoms.Please note there doesn't seem to be a YouTube teardown video for this trackball if you do want to replace the bearings. You're going to need a small torx drive, small philips screwdriver, 2.5mm zirconium bearings. The screws are hidden under the rubber feet of the trackball and the paper with the serial number / device info pronted on it. Once all the torx screws are out you can get the lid off (just go round with your nails or a guitar pick to pop it open). you then need to pop out the trackball cup (it's got two clips attaching it to the base of the unit on the left hand side and a bigger one on the right hand side). Once it's unclipped you can remove the cup without having to decouple any of the ribbon cables, however you're going to have to unscrew and detach the optical tracking unit to get to the final screw keeping the trackball cup halves together. When the screws are out VERY SLOWLY AND VERY CAREFULLY part the two halves of the ball cup apart, as soon as they are apart the small bearings will drop out if knocked. Replace them with the new ones and very slowly and carefully put the two halves back together then reassemble the unit in reverse order as above. Like I say it's about a 20 minute job. Good luck.

I think the product is good, but it just didn't fit my needs and I ended up returning it. The device itself is very well made, but there are some flaws which were deal breakers for me.1. Flakey drivers. I could not get the mouse assistant to recognise the mouse when using in Bluetooth mode. It only seems to work for wireless. That is for two Win10 machines. The Mac version works well for both wireless and Bluetooth.2. Related to the above, the wireless dongle would sometimes disconnect and no amount of clicking would bring the mouse back to life. I had to remove and re insert the dongle at least two or three times a day.3. I couldn't for the life of me get the precision dialled in which made making selections in cut and paste very difficult.4. A minor issue, the scroll wheel is very notchy. Sort of rough feeling, but it works well. It just doesn't feel as premium as it looks when in use.I have a logitech mx-ergo, and hate the rubberised coating, which in less than a year is beginning to go gooey. If the driver issues and precision of the Deft Pro ever get resolved, I'd re-purchase, in a heartbeat.

I bought the mouse for 3d cad. It is nicely designed, fits well to my hand. The programable buttons make it easy to perform actions that used to take several button presses. I can not comment on the gaming but I think it would be fine.I mouse is smooth . The button presses are positive. So far I have been using it for over a week and not had to change the battery. I use it on blue tooth. But have tried the wired mode and that works,well too.The dpi was less than my previous mouse but in the high mode it is,still good enough for the cad program I use.

Very good mouse but the software I downloaded to change the button layout has strange effects on my Mac, the mouse itself is very good and does get smoother with use, i noticed that when I clean the ball at first the movement is a bit jerky but after using for a few hours it gets smoother movement again, this mouse is the best I’ve used in long time and would definitely recommend.

If like me you have been searching for a trackball that compares with the Logitech T-RB22 (if you can get your hands on one) then call of the search and give this try. In many ways it's far superior, only slight downside is tracking speed adjustment is limited but just takes a little getting used to. Brilliant...no more scouring the world and paying silly money to replace my Logitech! T-RB22 move over, finally there's a new kid on the block!!