NVM, the crappy mousepad reflects the laser I think, it works well if you use it on paper.
I just got a new Dell about 2 months ago, and it came with an optical mouse. Ever since we got the mouse, it's been really twitchy and inprecise. For instance, let's say I want to move the mouse horizontally across the screen, in a straight line, it doesn't move straight, it goes and and down in a wavy of zig-zig line. Also, it's hard to click on the scroll bar because it twitches around a lot.