Logitech LX3 Optical Mouse
By Attack-Gorilla onThis mouse has a great look and feel.I purchased one and then tried to do some very precise art drawing.However, I noticed that any small movements always resulted in the mouse pointer on screen traveling up and to the left.Large movements seemed fines, but it was impossible to get good accuracy.I thought it might have just been bad luck, so I exchanged it for another one of exactly the same type and got exactly the same results 9the mouse would uncontrollably veer up and to the left).
So, if you want an inexpensive mouse and have no need for precision then go for it.Otherwise buy a different mouse.I don't know if this is an issue accross the board for Logitech, because I decided to go with a different brand in the end to save me from another trip to the store.

Weird. Usually that only happen to me when the batteries were low. Its hard to find a good mouse these days. :)