Greenmangaming.com / Does it worth?

Buy from there all the time, you get keys but can only buy a game once per profile

They'll give you the key once it's released. For now, they'll just give you the key to the browser-based minigame that unlocks some in-game rewards. Of course you also get some other bonuses too, i.e. Bioshock + a game of your choice out of the 5 that are available.

My current problems aside I've got some great deals from gmg.