I am very interested in this game but I read in a German review that in co-op the game only saves in between chapters. So you would have to completely restart a chapter if yout quit out of the game in the midst of a chapter or lose your connection etc. Having to play 2 or 3 hours straight just to get the game saved is a no-go for me. Can anyone back up this information?

well for the PC, no one knows because it doesnt work

What doesnt work? You cant save youre game? Youre game isnt working? What exactly do you mean?

I think about buying the game for PC and stuff like this makes it easier for me.

It seemed that it saves at checkpoints throughout the chapter. 1.1, 1.2, 1.3 ect. Me and a buddy were playing yesterday, starting from a new game, then I crashed. Made another game and we were able to start where we left off. So, I'm pretty sure once you get thru a checkpoin it unlocked permanetly for that character/save file.