Finished the game with a lvl 33 Witchdoctor along with 2 friends.
yay! time for Nightmare Difficulty :D
On the off side though, Act IV in it's entirety was kinda.....meh. I didn't like the last couple hours leading up to the finale much. Kinda cool, but i feel like the game started dropping in terms of interesting factor after Act II. But it was great overall.