optical mice

When I first got my Wireless Turbo mouse, I found the transparent blue ball to be a little sticky, so I dropped the putty-colored ball from my old ADB turbomouse into this new one and found it to be smoother . OK. But then my first Wireless Turbo Mouse sucked batteries; I had to change them about once a week. Kensington replaced it, and now I've been using the replacement for about a year and I'm finding that the cursor jumps randomly all over the screen. New batteries helped a little but I can be working and suddenly the cursor will jump to the other side of the screen-or if I'm word-processing, the cursor will just start drifting uncontrollably down the line. It's disastrous in Photoshop. I'm going back to usb. And I'll probably buy a Kensington Turbo Mouse.