A word of warning, I just booked a three day rental on Hotwire assuming company didn't matter since they should all be out of the Rent a Car terminal and got stuck with Sixt, whom I never heard of. Granted they are across the street but either I have to walk over there with luggage or grab a second shuttle. I wasn't pleased as the description said on airport/shuttle to vendor. Not shuttle to rental center and second shuttle to vendor. At least the few reviews I've seen for Sixt were pretty good. Anyone have experience with them?