Yeah, I grabbed my copy last for 5 bucks. I played a little bit last night. No, you can't use your save game from the vanilla version as the Director's Cut is an entirely new game. I wanted to try the new game + but you gotta finish the game again! The graphics do look a little better too and I absolutely love the commentary while you are playing. Very cool stuff. This was 5 bucks well spent for me.
Cities: Skylines is exactly what I've been looking for!