great product. i've always preferred a trackball over a mouse. i lose track of where they are on the desk and bang them into things and sometimes they go flying off the edge. a trackball stays in one place, so that's not a problem. they are great for limited spaces or to use with your laptop in bed. only drawback is that most don't have a scroll wheel, but i can't think of a good place to put it where it wouldn't be in the way for me, so that's not really much of a drawback. logitech is a great brand. i bought this one to replace my old one. last one lasted 8 or 9 years. it's still working, but the left click didn't want to hold 100% of the time anymore. i will keep it around as a backup. yes, they are more expensive than a mouse, but totally worth it when they last that long.