Pros
Work life balance is the most obvious and most compelling benefit. You can leave the office at 5:00 everyday and not have to think about work while you're out of office. If you desire a stepping stone onto something else and foresee only staying at this company for a couple of years -- then this could be a good option for you. Especially if you are fresh out of undergrad - I think a position within PM or IAD is a totally reasonable option. Just don't stay too long - unless you have carved out an amazing niche for yourself.
Cons
Virtually all of the work in PM would be done by a precocious high school student. Upward career mobility is awfully unexciting. Pay is no great. But bear in mind two things -- 1) You generally have very easy work hours and 2) At DFA virtually everyone is dispensable and everyone understands this.