Really cool spot for a club-- old WW2 bunker. I went for a pop music event and got there about half…read morean hour after the start time. That seemed to be a pretty normal time to arrive, as there was a line from the door to the street, but we were let in in groups fairly quickly (within 20 minutes).
They will check your bag, but will not pat you down. There are four long flights of stairs to get up as well! So think ahead if you have physical disabilities.
At the start of the night, the line for the coat check was absolutely huge. I would recommend dancing/waiting with your coat/bag for a while if you can and coming back to the coat check further into the event, as the line will be shorter and quicker. It was €2 to check a coat or bag- if you want to check both you have to pay €4. The people working the coat check are definitely some of the rudest people I've seen as club employees anywhere, but just roll with it. Avoid the young woman with dark hair and a septum ring if you can at the coat check- she has no patience for anyone who hasn't been there before and will roll her eyes and push your stuff back at you aggressively if you put it on the counter too fast.
There were 2 different bars, so you could usually get a drink pretty quickly. Prices on the drink card aren't what you'll pay! I have no idea why. (Ex: tequila shots are listed as €5 each, but I paid €6 for 2.)
This might be a European thing (coming from an American) but people really like their personal space at this club. Bumping into other people repeatedly will get you annoyed/strange looks, and it's definitely not a body to body, shoulder to shoulder type of place.