I'm not sure what a few of the negative reviewers are thinking. Who picks up a car with out doing a walk around on site? I use this service all the time and it's great and very convienent. Folks are always pleasant, and it's competitively priced compared to normal daily self parking rates at other "hub" airports. Most of the complaints I've read are people being careless and not using their head.
They haven't done wrong by me at all in 2 years and about 40 times of using them. You avoid many problems when you call when you land to make sure your vehicle is ready and do a through walk around to make sure that there isn't any damage.