This game is super fun and quite tricky in spots. Played it for one night and was hooked. Only complaint I have is that in spots the art direction and visuals are so good it is tricky to see where you have to go next. The puzzles will have you scratching your head every now and then, and then when you see the solution you'll wonder how you missed it. Glados is a highly amusing antagonist who constantly berates you in the most hilarious ways. Over all this is one of the best games I have ever played, just hard to navigate between puzzles at times which can get frustrating, but takes very little away from the overall gameplay.
If you are looking for a PS3 game to play and haven't played Portal 2 yet give it a try. The puzzles are fun to solve. In addition the voice acting and script are very well done and will keep you laughing. Since the puzzles do not change with each play through gamefly is a great way to play this game.