The guys who worked on my car were very nice and knowledgeable. They gave me objective advice and I was able to make a well informed decision about my car and what needed to be addressed.
Once you figure out how exactly the process works, it's pretty easy. The shuttles are very regular & if your flight return is really late at night, you just call the Hilton airport & choose "operator" & they let you know when shuttle will arrive. (Please tip the drivers-it's SO much nicer/usually cheaper than the airport parking)