Evan, I'd wait a while and get them cheaper from Amazon. I'm SURE they'll eventually be available through other retailers besides MPI. Don't give in to their scam of forcing you to join their stupid club to get them.
I don't think it's such a bad deal, if you are buying the whole package. On Amazon, individual sets sell for about $44.99 (if memory serves correctly) That's the price you get if you pre-order. I believe it goes up if you wait a while. MPI is selling them for $54.98, significantly more than Amazon, per unit. If you figure the cost of all six though, Amazon would cost you about $270. MPI is selling all 6 for the price of 5, which comes to about $275. Both outfits ship the packages free. MPI also gives some freebies for buying. The main reason I'm ordering from them is that I don't want to take a chance that they may not be available long after MPI releases them. I know it's a longshot, but I"m going for the sure thing.