Pros
Work when you want - contribute part time when you like, but over 10 hrs per week. Very enthusiastic bunch of contributors. Its a place where you can contribute or not contribute if busy and still feel a sense of being part of something big. No pressure since there is no pay. It is sold to potential workers that you work for stock options, that could pay off one day (see Cons).
Cons
-Although its a crowdsourced company and they boast hundreds of workers, in reality there are about 25 real contributors who advance the project. -Workers compensated with stock options assuming the company goes public one day. As of mid-2016, no plans to go public. -Company has not raised any significant money, but that could change one day -Not much progress in engineering or anything over long periods of time -Not much incentive to stay engaged.