Pros
If you like drinking alcohol, you'll fit in.
Cons
"Work hard play hard" ethic = we will buy you drinks so that you think that pulling 12 hour days is fun. No management presence at all, teams of all sizes are flat and are expected to self-manage. My boss was generally triple booked for all meetings and never paid any attention to me at all. Someone internal posted a glowing review of the company on Glass Door just days before a big round of layoffs to counteract critiques, but don't buy it. This was the worst place I ever worked -- very long hours with no support. Worst of all, when they (inevitably) failed to make their numbers, they'd just cut a bunch of people and then just let the remaining folks pick up the slack. I literally cried on Sunday nights when I thought about going back to work on Monday morning.