Logitech Ergo M575 Wireless Trackball Mouse - Easy Thumb Control, Precision and Smooth Tracking, Ergonomic Comfort Design, for Windows, PC and Mac with Bluetooth and USB Capabilities, Black, Medium

I've been using the Kensington Orbit trackball for a while ( 3-4 years) and got this as a replacement. Compared to the orbit, this has buttons very similar to a regular mouse (an actual middle click instead of a combination). Unlike my initial apprehensions, the thumb trackball is actually more comfortable than the index and middle finger trackball on the Orbit.The other reviewers in this product page appear to be transitioning from regular mice and I figured there is some value in a review from someone who has used trackballs for a while.I didn't care much about the ergonomic tilt feature, my main motivation in using trackballs is to reduce the strain in my shoulder and right upper back. The M575 and trackballs in general help quite a bit with this. As an added bonus you can place the unit in tight spaces where a regular mouse would be hard to move around and also on surfaces that aren't mice friendly. After a few days of use, the M575 appears to be very comfortable to use, even more than the Orbit.As for the use case, I use it for CAD on a 27 inch screen and everyday point-and-click. While it was not used for gaming, I suspect that it should be quite feasible to use for casual non-competitive gaming.For large cursor movements, you flick the ball so that it spins freely in the direction you need. For fine movements, you'd control by holding the ball with the thumb. I didn't feel any strain in my thumb, but I think it's important to not overextend your thumb while using the mouse. Keep the sensitivity high enough that fine finger movements will let you use the pointer nicely but low enough that it's not too difficult.It can connect via bluetooth as well as the Logitech dongle, which allows you to switch between computers easily. It uses a standard Logitech usb dongle, which means that if you lose it, you could reconfigure the one from another Logitech unit (doesn't have to be this mouse model). I think you can also configure the dongle to connect to a Logitech keyboard as well, simultaneously.Now, coming to the downsides:1. It's optimized for the right hand. If you're ambidexterous or a leftie, you're SOL.2. The 2 extra buttons are mapped to forward and back. You need to keep the logitech software running to reconfigure this. --It appears to not remember the change-- This can be an issue when you work in an environment that disallows installation of software like logi-plus that downloads additional stuff from the internet. It's also an issue on Linux where logi-plus isn't officially supported. My preference is to map these buttons to page up and down but on this mouse, it's not that viable.3. The trackball needs to be periodically cleaned. You'd need to take it out, wipe the insides of the cavity and the ball using a damp cloth or a tissue wetted with IPA (alcohol). Then lightly lube the ball with silicone grease or maybe vaseline.4. The trackball doesn't give you the finest of movements. It's slightly jerky. You'd need to find a sweetspot with the sensitivity settings where this is not an issue for what work you do.

Big in size for my small hands but loved the way it is actually.

I have always liked & preferred the trackball mice for their comfortability. I did consider the Master series too, decided it did not suit my requirements. Have bought the M570 trackball twice &it has lasted me long enough. Still have one functional. The M575 came in its classic Logitech robust packaging. The M575 has the Bluetooth connection in addition to the unifying receiver. Am using it regularly with the Bluetooth, so that frees up my USB port on the laptop. It's good for medium to large sized hands. It's slightly larger than the M570 in few areas such as the hump, feels good & ergonomic, esp. with those ribbed curves at the rear end at the palm rest. Haven't tried gaming with this mouse, only used for work. These Trackballs are a good ergonomic option for people who tend to work with restricted area availability, so you don't need to move the mouse around. I would expect the M575 to perform for a good couple of years like it's predecessors which I still own. That's value for money.

I have been a long time user of an older version of this mouse. The older one was lagging on my new mac, and even worse when the mac is connected to an external display. This was my concern before buying this product, but it worked surprisingly well. Connecting it to the mac was a breeze, no need for an adapter and the battery is already provided in the device. I was up and running within seconds. Highly useful for long hours on the desk, but you have limited gesture functionality compared to the magic keyboard or trackpad if you have one, so I recommend keeping both around for different types of workflows. All in all, recommend this product.

Top notch build quality and great ergonomics. The ball moves smoothly and buttons are pleasant to click. I only use it for daily office work, no idea about gaming. Works well in linux, without any extra effort. Life is a lot easier when one doesn't have to move the entire mouse around.