Try doing a search on the budget board. They have discussed it a lot over there. One thing they have is the largest discount on park hopper plus passes. I don't want the "plus" so it doesn't do anything for me. also the quick and casual lunch vouchers are a good deal if you use it at certain resteraunts. I don't know the details, though. A lot of people seem to join it for the trial period only, get the vouchers etc that they want, then cancel before they have to pay the yearly fee. (whether this is ethical has also been debated, I think)