No need to buy it for co-op. The pirated version supports co-op, only for pc though.
Honestly i wouldn't waste my money on a game that will only last 10-20 hours. Your going to finish it and MAYBE play it again; after that its just going to collect dust.
Just torrent it, finish single player, finish co-op and now you can fit in and talk about it.
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I finished pretty much all single player trophies except that breaking 11 monitors glitched out on me. :( Did a few co-op and its fun too.

PS3 version comes with steam version dlc code (except u have to wait until PSN is back up and running). So if u havent bought this game and thinking about it, get PS3 and use that code on Steam and trade the game in to get some money back. ;)

Great game indeed. I have never play Portal 1 and now I want to find it and try. :)

bump for an awesome game...just got it today...loving it lol

portal 2 50% until october 6! only $14.99!

just (finally) picked it up!

I bought it last month. I completed it, and the storyline is excellent.
I haven't even tried co-op yet, but I'll do so later.

Definitely worth the money, even though you may only play through it once.
The game is much longer than the first one.
Waayyy longer... it's an actual full game this time.

And the puzzles are a lot more challenging, with lots of new "props."