Went into my local Game @ silverlink in Newcastle and the guy was dropping a load of prices down on the PC games in store!
Saw him put a 4.99 sticker on this and thought i'd give it a punt!
The game installs using Steamworks so once the code is redeemed its locked to your steam account for good.
This game was down as a GFWL but I played online with a few random people in coop and the GFWL overlay never showed up at all, also the updates were done via Steam once the game installed so not sure if they patched it out or what.
I know the Steam sale is on at the moment but this game is only at 33% off and may not end up with any further reduction in price. I was trading in some old Xbox games anyway so it was ok for me getting it instore!
Game is pretty good, not earth shattering but its fun in coop and the graphics are decent too.