Just got the Decay PC port... Man is it frustarating. I'm on the fourth/fifth level, and I got plowed down by controllers. On the map before that, I got stuck on the minecart puzzle, then killed by vorts. Then, Rosenburg got stuck on the stairs.
Oh, well. As soon as I get a new computer, a friend and I will play REAL co-op. In the meantime... I look forward to using the Rosenberg and Keller models in mods...