The first thing everyone (who was familiar with the game) noticed was how much more there was. The scenario was huge and we had a lot to do. We had to search both in and outside of the prison for blueprints and maps to be able to explore further in prison later. We had 3 different door controls and countless rooms to search.
One new game mechanic that works to the survivors' favor is that when they die, they become zombies... but maintain their free will. Their abilities change but they still fight for the good side. And they're harder to kill now!
Al decided to become a zombie intentionally but that may have backfired as his skills changed in a way that made it tough for him to do much.
In the end, it was a bit anti-climactic. The toughest parts of the game were in the middle. And it was long. But it was still great fun and an excellent second installment of the game. I look forward to trying the expansion with the toxic zombies!