Pros
Great pay, much higher than anywhere else for same role. Very bright and accomplished people around me. Ambitious plans. Nice food, nice locations. I really loved living in Westport, but it's not to everyone's taste (or budget).
Cons
The culture is definitely a downer for the vast majority of people. The idea is for everyone to help each other improve, which sounds great in principle. Sadly, in practice, every diagnosis meeting starts with the premise, "Maybe you're not the right person for this role or this company", and it becomes very hard to be objective and open about weaknesses when your livelihood is on the line. (The location makes this worse, since many people move to work at Bridgewater and are isolated from their home networks and alternative jobs. The long non-compete and the insular culture exacerbate this.) Culture is dominated by bright people with limited experience, leading to a lot of "good ideas" that are actually just repeating old mistakes made elsewhere. The same bright people are encouraged to be somewhat deaf to new ideas from others. I found myself acting the same way, honestly; it was very hard for me to hold my independent point of view in the middle of that culture.