I've returned games after playing them for a bit, saying that I just didn't like it(which is usually reason enough around here for a return) and then they let me pick something else out.
Or, my all time favorite, I grab a game I think I'll like, play it for a bit, then if I don't like it, I just say it doesn't work and that I don't wanna take a chance on another copy.
Then, you look around for a bit and if there's nothing you want and are really adamant that nowhere does it say you can't get your original payment back from them within the 7 days, they give you your original payment back(cash, credit,chargeback on a CC, etc).
I've successfully 'tried' a buttload of games I later on didn't like this way thanks to their lovely policy. It's the ONLY halfway decent part of GS corp.