I'm playing it on the PC. We only have a regular Xbox so we don't play many FPS games on the console, lol.
I just finished the first one last weekend. So far, I've only played about 1-2 hours of it, it's pretty difficult compared to the first one! I beat the first one on easy since it was my first FPS and have Bioshock 2 on easy as well. The big sisters and big daddies are noticeably harder. And the controls are taking a while to get used to. I don't like pressing ctrl for first aid, and I might try changing it again. Maybe it'll work this time.
The graphics are much better too. And the music is more suspenseful.