Pros
The managing editors in SF are smart and funny and quirky. Also, the flexibility of being a proofreader at Geotext is a huge selling point. You make your own schedule each week (but you aren't guaranteed the hours you request), and you can take weeks off at a time basically whenever you want to, with a reasonable amount of notice.
Cons
Geotext hasn't given me a raise, and I've been working there for around 2 1/2 years. The fact that Geotext doesn't regularly give raises to longer-term part-timers suggests that the company isn't interested in employee retention (at least when it comes to proofreaders) and isn't at all sympathetic to the challenges posed by the exorbitant cost of living in the cities where its offices are located (SF, NY, London). Also, on the editing side, there are few opportunities to learn, grow, and advance. And the office culture can be downright dismal: many of my colleagues, including some managers, come and go without even saying hello or goodbye. The project managers often don't even make eye contact with anyone on the editing side. This wouldn't be so surprising if we were a large office, but on any given day, there are usually only around ten to fifteen of us there.