I diasagree with only being able to test drive the car if one puts down a deposit, and that you don't deserve a test drive if you have not put down a deposit. I can not tell you how many times I receive offers from Porsche, Caddy, MB and Lexus to perform extended (i.e., 2 to 3 day) test drives of their vehicles with no deposit and nothing more than providing a copy of my driver's license. No salesman accompanying me on the extended test drives. In fact, Porsche is even so nice as to bring the car to my office or home, so I do not have to go to the showroom.
Having said that, I should note that I have reservations on two Model S's, and have taken several test drives of the car. All I have done is call the DC store and schedule a day and time. However, a salesperson allways accompanies me on the test drive and I had to sign a release one time. I should also note that I test drove the Roadstor about 2 years ago; I really was not interested in the car but Tesla insisted that I try it and brought it to my law firm to spend several hours driving. A salesperson accompanied me but I never signed any release form (I was asked to sign a release form the second or third time I test drove the Model S). And in case anyone wonders why so many test drives of the Model S, they were to help me decide between the regular model and the performance model.
The DC store is accommodating. If it is Tesla's policy to limit test drives to those with reservations (and I am not sure that this is the case), the policy should be changed. People do stop in car stores to look and drive cars without necessarly buying at that moment, but intending to narrow down their choices. People want instant gratification. If one can not drive the car, Tesla runs the risk of losing sales. And that does not bode well for all us early adopters.