Yeah, cdkeys.com has been around for quite awhile. I tend to think they would be a little more notorious by now if they didn't sell keys that worked, and the vast majority of user reviews I've seen are positive.
I've never purchased from them myself, but I'm highly tempted now after seeing that price for the new Doom.
I've never purchased from them myself, but I'm highly tempted now after seeing that price for the new Doom.