I just learned Priceline Uses Hotel.com to book the hotel reservations. I've had horrible experience with them in the past where reservations are made on their website and not transferred to the hotel, so I'm sitting in a lobby expecting to get a room, and the hotel doesn't have the reservation. I spend an hour at midnight trying to get another hotel. Then trying to get my money back from their screw-up is a nightmare as well. The 866 number put me on hold for 30 minutes and then suddenly hangs up on me. I finally just called my credit card company to get my money back!