Pros
Lots of companies say they're going to change the world. This company may actually do just that. Almost all of the employees join to be part of that change. You develop friendships based on common interests and values that are forged forever by shared battle experiences. The members (people in the space who are not employees) are really interesting and many are inspiring. Also a lot of famous people come through to visit from everywhere like Russian billionaires, Ashton, David Chang (momofuku), Jerry Stackhouse, every big VC, etc.
Cons
It is exhausting physically and mentally. Your family and non-wework friends will not understand and will resent that you're prioritizing work over everything. (It's because there's always so much riding on you finishing as quickly as possible with the highest possible level of quality. This isn't ego. It really is that important or else you will be causing work and problems for someone else on the team who you love.)