Unnecessary long lines, more like a backyard upscale party than a bar
A great way to start off with a bad impression is to have a potentially paying customer wait in line for 50-60 minutes when the place inside has enough room for everyone in the line plus some. I understand you want to have a line outside to make it appear that your place is legit and popular, but once you go inside you find out the truth. Upstairs, the actual M Lounge, has a nice decor to it, but it's too small to comfortable fit 50. It's probably half the size of Library Bar. So most of the time you're stuck downstairs in the Reveal part of Republic. It's all outside (which is neat), the DJ was good, and the service at the bar was quick. But I need something more. There's no place to sit at all (unless you get bottle service and even then they are just couches on the sides of the wall). You're force to stand and kind of awkwardly dance, although there's no dance floor - meaning that you and your group could be dancing, but everyone else around you will just be standing. Really, this place is just a failed bar that they're trying to make into a quasi-dance club.
Just avoid this place.