KensingtonExpert Mouse - Wireless Ergonomic TrackBall Mouse for PC, Mac and Windows with Ambidextrous Design, Optical Tracking, Scroll Ring & 55 mm Ball – Red (K72359WW)

I gave this an honest 5 stars for these reasons. I have loads of optical pointing devices, all of which perform the task they were designed to do. I spent my whole working day at my work station. Some tasks are keyboard orientated like writing software for example. My current role as an electrical design engineer has me working with AutoCAD Electrical. All modern software uses icons and sub menus, well AutoCAD takes this into the next level. The fine motor skills required will leave your wrist aching and I am sure long term abuse will bring on RSI’s and the like. Roller ball devices like this, leave the cursor where you left it, this is hugely important with CAD software. Also you can use your palm to move the cursor, or your finger, or your thumb. The spinning ring is also a huge benefit as it makes zooming easy. There are other functions that can be assigned to the buttons that make your life easier such as ALT and CTRL.. so by pressing one of these, you can change how the mouse responds. Another good choice is the roller ball mouse that requires your thumb, it depends what you do on a PC. This is not a cheap mouse, but it is a good mouse and w outdoor recommend it for CAD work.

Why, why did I wait to buy one of these it's beyond brilliant.First up let me explain, about 3 months before buying this I had a fall and broke my wrist, broke 2 bones and did some ligament damage - ouch, yes it's as painful as it sounds and if you take nothing else away from this review be careful with icy pavements.The healing from a broken wrist can take up to a year in some cases and a lot of pain ensues while thats happening, when I had a cast on for 6 weeks towards the end there was no discomfort hardly at all so in my head it's yay, cast off, back to normal, rock on. Er no, as the cast came off my reaction was mm ow ow OW OW! MOTHERFU.... that hurts, and so began a quest to find someting I could use comfortably and get my extremely bored arse back to work.So finally, the trackball itself, what can I say, silky smooth operation from the actual ball, being 55mm across it means you can control it with three fingers if needs be, the four buttons around the ball are totally customisable if you download a small application from Kensingtons website and you aren't limited to four functions either, you can add keys to each button so you get a different function if you press shift, or control, or alt or the win key so four individual functions on each of four buttons - that's a lot of shortcuts. In addition to this you can specify a set of shortcuts for each application, the combinations and permutations are mind boggling. There is also a scroll wheel right next to the ball and again it's customisable in terms of speed and direction and inertia which I tried but didn't like but it's worth looking at it to see if it works for you.There is of course the usual pointer speed control which using a super ultra wide high resolution monitor I have set quite high to quickly move around the huge screen area, that is fine but it's not the most precise method - however Kensington have thought of that too, you can set one of three keys to instantly and temporarily lower the pointer speed making precision a doddle, there is even a setting to lock the movement to just vertical or horizontal movement in a single axis and while this might not sound like the pinnacle of technology if say you have a bunch of tabs open in a browser or are going through a bunch of drop down menus in a professional application such as Photoshop or illustrator - which I do all day every day while doing actual work it just makes it even easier - hence quicker to use. It's just one more reason to like this trackball and why I will NEVER go back to using a mouse again - ever.Looking at one of the other reviews there was a criticism that you had to float your arm to use the trackball and it placed strain on your arm/wrist - well as this was the entire reason I'd been looking at things like this trackball to reduce just that and allow me to get back to work take a look at this...https://www.amazon.co.uk/gp/product/B0752MCX82/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1It's basically a device that clamps to your desk and cradles your arm taking the weight and strain away from your arm - and crucially for me the wrist, a combination of that cradle and this trackball means I have a perfectly straight arm position from the elbow to fingertips and the sometimes unbearable pain of using a mouse - and i've tried 6, everything from gaming mice to really thin bluetooth mice to smaller sized mice, even a vertical mouse has gone, I can use this for hours with nothing more than the odd twinge - using a mouse all day I'd have to mainline so many painkillers it'd turn me into a zombie.Very seldom do I buy anything that makes a real improvement to my daily life but this is definitely one of those times and I don't like this trackball I love it.

Quite nice to use, but I think the ball could do with a bit more inertia for more precaution with fine movements and speed for faster movements. Also quite expensive, but will probably last. Mine has a torn battery removal strip, but it shouldn't be a problem.

I had the Kensington orbit with scroll wheel previously, which stopped working after 18 months. Kensington is willing to send out a replacement which will take 2 weeks which is a long wait.Decided to get the expert as an upgrade as I cant wait that long for a mouse.The expert is a much bigger unit and the ball is probably double the size. Overall it you feel it is a better product and has 4 programmable buttons instead of the normal 2. Ironically because of the size of the ball and the placement of the buttons. I dont have the top 2 buttons as left and right click. I have bottom left as left click and top right as right click.There is one slight niggle the scroll wheel is a little too close to the right buttons so sometimes you nudge the right buttons when using the scroll wheel.If you are on a budget the orbit is fine but if you use the mouse a lot, the expert maybe worth considering

I've used a Kensington Trackball (wired USB version) for years and decided to try the wireless expert version to cut down on the amount of cables I have at my workstation. I've only had this for 2 days and here are the issues:-1. The bluetooth connectivity is poor. It says to switch the mouse on and hold down all 4 buttons for 3 seconds to connect. This just doesn't work. Sometimes it connects to bluetooth suddenly without holding down the buttons but this is hit and miss.2. When the mouse is left for a short period of time it loses connectivity and does not wake up until I switch it off and on again using the switch on the underside. Also hit and miss whether this wakes up the mouse. Many times I've had to restart my mac and then it connects on start up.3. The wireless functionality worked ok for about 30 minutes and then the curser became erratic. It would drag, and then suddenly move erratically across the screen. I am an editor so this renders the product useless.I love the design and the coloured ball but it's useless as a mouse as I've spent more time trying to get it to connect and trying to solve the erratic functionality. I will have to return the item and opt for a wired USB version again. Very disappointed