Summary: Purchased imouse to replace wireless mouse. Previously owned Logitech and MS trackballs. I returned Adesso mouse because it is badly desined. Difficult to operate when dragging items acccross entired screen while holding down left button which is too close to trackball. May be ok if one has small hands. Also ball became difficult to move after 10 minutes use, cleaned it 3 times, no effect. Purchased Orbit Trackball. Very happy with it.
Summary: It preforms great an it is easy to clean an keep it functioning with out the drag an or no response from long term use. Love the ease of install an since my medical problem I have moved the trackball to the left of the key board an I fill that the trackball made it a lot easier to make the change.
Summary: The trackball is huge and the body of the mouse is as well. What that means is that for anyone other than someone with hands the size of a catcher's mitt, using this mouse is just too cumbersome. Took up way too much of a footprint on my desk for a trackball and took way too much force to click or roll. I actually managed to strain my thumb and palm using that thing. Ended up going to a 20.00 basic mouse after. Will never buy from that manufacturer again.
Summary: I've used many trackballs and this one is very poorly designed. To drag & drop, you must use your fingertips over the top of the ball to touch the button(s) and still somehow move the ball with a part of your hand that doesn't exist. It is also not ambidextrous. Kensington makes a better unit.
Summary: The trackball itself was well made and had good features. However, it simply would not work with my hand. Nor did I much care for the scroll wheel location. Long story short, I retired it within less than a week because it didn't fit my needs or my hand.
Summary: I have used the old Microsoft track ball for years and got very used to it. When I had to put in two more pcs, each for a different purpose, each with the operating system that the special hardware would run on, I was limited in space for a mouse, and I purchased two Adesso units. The main ball and left right clickers were super good! the scroll wheel, on one is hard to turn, but works, that is why I dinged the quality one notch.