Lol I honestly am 20x worse without my normal mouse lol. I do have two of them though so nothing will go wrong for me = P. Also i have 3-4 of the exact same mouse pads so. Also i like to tweak my dpi up or down depending on the class.
7.5 average, I can from class to class
For example; with a sniper I have it set at 2 because aiming a little to the left in a second can cause your mouse to go mental if you go too far... but for fast moving targets this kinda bites you in the ass XD
Heavy would be 10 so pyros don't get you from behind etc
You get the idea ;D