I went with a group of 7 for a birthday and we did the residents room. The entire thing was incredible. Brad was friendly and helpful in his run down of how it worked and he gave great related hints when we were really struggling or got way off track. (by great I mean not just giving you the answer but also not giving you some crazy riddle you don't understand. Just a simple nudge back on track.)
The room had an authentic feel to it that helped immerse you in the story. The puzzles were difficult but fun. I definitely would not have solved all of them by myself, so having other brains there is crucial. We solved it with 36 seconds left on the clock so the whole hour was pretty exciting.
I loved the whole thing, I exercised my brain and I left with a lot of pride in what we accomplished. Totally worth the money and a cool, unique way to spend an evening with friends.