Pros
It is more than just a retail job!! I had great managers and I worked at 4 different stores. They go to great lengths to hire great people, which makes the job worthwhile. They also offer some incredible benefits, given it is retail. And corporate puts in the effort to keep employees engaged at all levels. There are lots of opportunities outside selling clothes.
Cons
It is near impossible to get a job in the corporate office... partly because everyone wants those jobs, partly because once people have a good job with Patagonia, they NEVER want to leave (which obviously speaks well of the company) and partly because there is a lot of favoritism and incest. It feels like they often promote based on who is friends with who rather than merit. (At the corporate level... stores all have their own personality and it depends on your manager)