Logitech wireless trackball M570
Due to some joint inflammation, I've been trying to cut down on the burden that a conventional mouse has on the wrist and hand. I work and play on a computer, and it's taking it's toll after all these years. I never thought that I'd go trackball, and so far I dont see myself going totally to it, but it's nice to have and definitely helps. For instance, I'll play a game w/ my mouse, then relax my arm w/ the trackball on my leg or armrest and give my wrist and hand a rest for a while when surfing the net or something. Last night was the first time that I actually gamed w/ the trackball, and for a 3rd person action game (The First Templar) it actually worked really well and I had no troubles w/ it.
I leave the wireless receiver plugged in, and just flick the switch on the trackball when I want to use it, it doesnt seem to interfere w/ the conventional mouse when operational. I just plug the receiver into whatever PC or laptop I'm on and the time and can use it instantly, quite handy.
One of the biggest concerns that I had was sensitivity - w/ a mouse I generally roll at about 2400 dpi, and using my fiancee's trackball as a test months ago I was getting like 400 maybe 800, having to roll the thing several times just to get across the screen. Sorry, that's just unacceptable. Thankfully, the Logitech M570 does indeed have sensitivity settings when using the Setpoint software, and while a specific DPI is not specified, when cranking it up i can get it moving so fast that I still have trouble zeroing in on the small "x" at the corner of a tab sometimes. Crossing the screen is one roll of the thumb. So yes, the sensitivity issue has been addressed, I've even had to turn it down a little until I was more acclimated w/ this method of control.
Overall, a good purchase for +/- $50 and one that's helped ease the wrist and hand issues brought on by excessive mousing.