I personally didn't enjoy it, but I think several factors contributed:
If you're looking for a high-energy club where people go wild, this is not the place for you. It's very low-capacity and has a very chill vibe, it's almost more like a bar. I was looking for something more exciting, so I was disappointed, but I can see the appeal.
I also got unlucky with the DJ (or at least, that's what I'm hoping). I'm not an EDM expert, but they waited way too long to build up to the drop without really going anywhere. Consistently, you'd be waiting and waiting for the beat to drop and it just... plateaued for a bit. People would stop dancing and just kind of stand awkwardly... But I assume the music is normally better.
FYI a basic mixed drink like a vodka/coke was about 8000 won. Pricey but as expected in Itaewon.
Pros:
Small environment
Cozy, chill atmosphere
Primarily local Korean people despite being in Itaewon
Near the subway
Cons:
Disappointing DJ (maybe one-time issue)
Not many people until 2am+
Hard to catch a taxi back (at least for foreigners)
Stamps instead of wristbands