Pros
The mission is admirable. Almost everyone is kind. If you take the typical entry level PM position you'll learn some valuable skills and have a respectable line for your resume.
Cons
The pay is not okay. They will say it is competitive and based on market research but it isn't and you should prepare to be very poor. They also say they value work life balance but they do not. You will have to work very hard over very long days and a lot of that work will be wasted because projects and priorities change at lightning speed and they aren't clear about what they want. The CEO seems to have good intentions but does not want disagreement and makes reactive decisions. You probably won't ever be able to truly own a project or make independent decisions. The people who survive there long term seem to do that by working themselves to death and giving up on any hope of truly owning their projects without intense micromanagement. Newer people mostly feel bad for them and feel like they can't complain very much about their own issues with low pay or heavy workloads because there are always 3 or 4 people who clearly have it much worse. People who can't or won't deal with that don't stay longer than a year or 2 on average. And that may be part of their overall plan. People leave and are replaced with new Stanford grads who will accept the pay and may not realize how comparatively sad the benefits and perks really are.