I do use it and (that one's for RyanTheSav
) they have nothing to envy Razor mouse.
You should have a + and - sign below the wheel in the middle of your mouse. With it, and without any drivers, you can go to 400, 800 and 1600 dpi. Really fast also and no lag at all. With drivers, you can add 2 custom resolutions, so you get even more choices. That's a bit overboards for me, but who knows for you.
For me, the MX700 was a Christmas gift. The kind of gift that "I didn't know I needed" if you see what I mean. Now it's the only mouse I use.