I'd purchase from OKS again!
I'm a eager user of Steam, and I often buy steam games, but my main problem is the very steep price of those games. I then one day found OKS, (OnlineKeyStore), and discovered that I could get Steam game-keys almost 50% cheaper. I haven't bought any AAA titles from Steam since then, always through OKS. The only reason I give this 4 and not 5, is that I have had a problem with a preorder, where I didn't get the key on release date, that is all. I'd purchase keys from OKS anytime.