I filled out their survey as well after paying for my reserved spot. I've been to several F1 races in Australia, Canada and Monte Carlo and I can tell you first hand that the slowest corner or one coming off a straight is the best. this is obvious from most races. Typically the pit row or front straight seats contain all the people who just want to be seen. the racing doesn't typically take place there unless you count the pits.
I will be buying a PSL on turn 1, no doubt. Just not sure if i want 2 or 4 seats yet. Maybe i should get a whole row for M3 owners only