Pros
Work from home, that's about it.
Cons
It's disheartening to see how some people seem to justify toxic behavior by citing the "startup environment," as if that allows for poor treatment of others. I've experienced intense micromanagement unlike anything I've seen before. Some employees act like managers even when they aren't, and the actual management can be passive-aggressive pretty often. Complaints about bad behavior often go ignored by HR. There are many meetings that seem excessive and unproductive, and there appears to be an encouragement for employees to be harsh with each other in the name of "company success." It's disappointing to see people compromise their values in this way (if they have any). Their reputation will suffer, and they will struggle to find employees in the future... Good luck with that.