Better than i thought, but anything over 90 degrees outside the car has issues after 3-4 hot laps. Once the temp gets to 290, I feel the loss of power but no limp modes. At that point I just cruise threw the straights or take it easy for a couple minutes and pit. Once the temps drop a bit I can run a few more laps to end the session w/o any issues. I have yet to get a full blown limp mode, but then again whats the point in trying. The car has a retro-fitted oil cooler already. Ideal, no, able to still have some fun, absolutely.
I hung out with a few others from e90post, they didn't have any major issues. But they did have MT, and also were running in the beginner group.
2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim
2010 E91 328i Space Gray,Black int, M sport, most options
2007 Montego Blue 335i (retired)