I played here last weeked, i can confirm the following;
Very well marshalled and no power trip marshals.
Very dark in places, you will need a tac light.
Very close quarter, no 'bang kills' so be ready for potentially sub 350fps 0.25 at point blank.
Very secure - once the gaming starts the car park / site is locked to outsiders.
Useful food and airsoft supply shop.
Toilets OK, but not in safe zone - have to go loo with eye pro on.
Personally i think the building is great, but the killer for me was that there were too many barricades in each room, the rooms are not big to begin with and this makes flow rather frustrating. What i mean by that is to really be effective you need a shit ton of pyro.
Theres also a few dead end rooms, would be great if they could be opened up / knocked through.