Yes, I've done that with most of the major rental companies, and I agree it does cut down on wait time considerably. My experience has been that the service itself still varies considerably by location (although I've still found it to be better when traveling on business). The vast majority of my rentals have been at airports and it's very hard to predict which ones will have better service; I've had very bad experiences at large airports where you would think they would have the process down pat, and good experiences at smaller airports.