I used to use them all the time, but I find they aren't quite as great as they once were. The main reason I don't use them much anymore is the inability to select which kind of bed options your room will have. When there was just two of us that was no problem, but with three of us it can become an issue. I find kayak.com is a pretty good place to search. I've had good luck with lastminutetravel.com as well. If you use lastminutetravel get the room you want and then call their 800 number, they'll give you a better rate than the online price. I saved 20 bucks that way two weeks ago. If you have AAA I find you can just go to the hotel's website and get the same rate as the online rate.