I did the firefighter room in a group of 8 adults. At times it was a little tight, and too many cooks in the kitchen (4-6 would be ideal), but what a great escape room.
I've done one other escape room [in Toronto], and this one was far superior. I don't want to give anything away, but this escape "room" was really multiple rooms with puzzles in each room, plus great structural design, decorations and some cool special effects to add to the experience (not sure why previous review said "not much tech").
Two staff members were friendly and allowed us to complete the game even though we had gone over our time by 5 minutes.
The price is a bit steep ($32 per person) for a one hour activity, but building that room surely wasn't cheap.
This room may be too difficult for children - try the 'Wild West' themed room instead.
A bit hard to find the place from the street - it was dark and I didn't notice any lit signs from the street; actually drove by it and saw someone else do that as well.
I will definitely return to try their other escape rooms.