Last year I started a thread about valet parking, because it was the first time I was taking the M5 to Las Vegas, some of you said it was "ok", some said "no way" I took the advice of the park your self crowd ever since. On my last trip to Vegas, we stayed at the MGM, my car was parked at the main structure seperated by a fence from the valet parking area. I observed the valet attendants driving the cars for about 15 mins. Every car that went by was going at least 35-40 mph up the ramps, wheels squealing around the 180 degree turns, brakes locking up before stopping, gears slammed into reverse before the car came to a stop to back in the spots. It didn't matter what type of car, suv, or truck they were driving. So beware if you use valet parking.
Nidan