Yes, it's one of my favorites. I'm recently finding myself with a few Z-Man games I want to picking up. I recently also ordered Saboteur published by them.
Pandemic's got quite a following, and new expansions about to be released. Pam and I have a pretty good time with it when we bring it out, quick enough to even play over a lunch hour at work as well. The cooperative nature is quite refreshing, and really does it better than other coop games I've tried such as Arkham Horror.