This place is freaking awesome! I went with a large group of friends (8 people) and we tried the atelophobia room. We heard that it was one of the scariest rooms and wow, talk about breaking a sweat in that room...we all were completely terrified at some point, and some of us left a little more traumatized than others. The game itself was very interesting, slightly difficult, but doable if you focus. Luckily we were able to escape with only 5 minutes to spare!
The trick is to go with the right amount of people. 2-4 people may not not be enough brain power, but with 6+ people, some might find themselves not doing anything productive. So keep that in mind!