I will need to park my car for 2 weeks near SFO. I was looking at FlySFO and they seem pretty convenient with the AirTrain stopping there and going to all the terminals. I also noticed their website allowed making reservations. All I could tell from this is that this guarantees entry into the parking garage when their sign is "FULL". I am unclear on whether a reservation also guarantees an open parking space for us to park our car. Will we be able to park our car? Or is there a chance that they're completely full when we arrive, and all we accomplish is circling around without finding a spot to park our car? What is your experience with FlySFO?