Well, I was asking myself yesterday what's better, a higher sensitivity ingame or higher dpi from your mouse. I currently have an 800dpi led* mouse, and it feels awful when I increase the sensitivity in any fps game.
Now my thinking is, that a higher dpi is better, since you don't have to increase the sensitivity and the software "smooths" your movements less. But then I asked some gamers I know and they all told me it doesn't matters, everything above 800dpi is useless.
What do you think? I wasn't yet able to test out a mouse with more than 800dpi, but I'm getting a 1600dpi laser* mouse later today, I'll then edit this thread and write how it "changed".
*As far as I know from googling, it doesn't cares that much if it's an led or laser mouse, since that's only about if you want to use a mousepad or not.