I just finished it, and man, is it a good game. Kinda on the short side of things, only took me ~3.5 hours to complete, but man is it worth it. The dialogue is top-notch, Sam with his crazy sayings and Max with his insane taunts and jabs, man is it good fun. If there was one draw-back (besides the time, that is) it's Sams voice actor. He dosen't really seem to be putting that much of an effort into the character, mor of phoning it in. There were times when it seemed genuine, but sometimes his lines felt forced.
Really, if you can afford a gametap mebmership, get one and get this game.