I've heard about it before and it piqued my interest, but $30 was a bit too rich for my blood. However, I'm happy to pay $0. I hope they get some good word-of-mouth (assuming it's partway decent) from this, which is certainly why they're doing it.
I'll let people know how I get on. If you fancy it yourself you might need to persevere as the site is under a bit of strain.