I am a member of it and LOVE the dicsounts. The service, well... that's another story!
The 3 day to Universal are a great deal with them and the Disn tickets they sell are a good deal, but not overly so and they don't carry everything.
The best part is that you try it out and if you like it continue, if not, discontinue.
We get %5 off on our vacation minus taxes, etc and they are good about it if you really follow directions about how toget the money back.
Jenn