Excerpt: This trackball is the price leader in its category. Its main competitors are the Logitech Trackman Marble and the Kensington Orbit, both of which B&H also carries. The Adesso has a bigger ball than either of those, which counts for something with me, and it works with silky-smooth precision.
Pros: Looks Great, Smooth Movement
Cons: Not Ambidextrous, Tough To Get Used To, Uncomfortable
Summary: If you have big hands this might be usable. I'd definitely find some way to try it before you buy though.
Pros: Looks nice. Feels well built, if a little light.
Cons: It's not actually any larger than my dead Logitech T-RB22, which I was hoping it would replace, but it feels larger because it isn't ergonomically designed. You have to take your finger off of the ball to left click, which makes it impossible for gaming. Horribly uncomfortable.
Excerpt: It took a day or two to retrain my hand but now I am moving faster than I had with any trackball I've used before. Forefinger is for left click, middle and ring finger for the ball and little finger is for right click. Thumb is just for scroll wheel which I use a lot for CAD. (Do not use you thumb for left click!)Kind of like going from playing a piano with one finger to using all of your fingers, takes practice but worth the effort.
Pros: Accurate Controls, Easy To Clean, Ergonomic Layout, Fast Response, Smooth Movement
Summary: good palm rest size for hand and good ball size for those like me who prefer to use their fingers rather than thumb on the ball, has all the functions but really needs to have the active portion of the button redesigned to extend further down the top of each side (R, L) because you have to turn the unit almost 45 degrees to make it comfortably functional. (i think someone else mentioned this too). Just a tiny re-design and it would be awesome.
Summary: Bulky and inconvenient. Hard to use. Uncomfortable placement of the ball in the middle of a large flat area makes it difficult to push the button areas. And you have to push too hard. I prefer trackballs, but I don't recommend this one.
Summary: Originally, I was going to give this a 3 star, but then I used it for a few more days and I got used to the one of it's quirks. This ball is a nice size and tracking is pretty good. If there's a market for making new trackballs still, and someone is looking for pointers, and they don't want to recreate the old Microsoft one, then get your hands on one of these and do something about the following issues: 1) It's symetrical.