You'll get some complaints how bad it is from some people, but they're dumb
There's 2 major complaints.
1. If you pick up the mouse and put it back down, it jars around and messes up what you had lined up.
2. If you move the mouse around really really fast, it messes up.
Truth: 1. Lift up your mouse? Who the hell is using this thing? I can do a 360 in about 1-2 inches of desk space. Which leads me to say that you don't even need a mouse pad anymore, so you really can't run out of room even if you did have the speed set really low.
2. If you have the speed set right, you have no reason to move the mouse THAT fast. The only time it really does it is if you move it at least about 12 inches back and forth really really really fast. You shouldn't move it that distance #1, and #2 if you moved a normal mouse that fast in a FPS, you'd throw up. Secondly, optical mice don't really need Acceleration because you start out moving as soon as you move your hand, there's no speed build up like in a ball mouse. Turn off accel, jack the speed up, and man it's incredible.