Pros
The work at Mercury is interesting and some of the developers here are the best I've worked with. Brilliance abounds.
Cons
The company's monetary focus is more on buying other companies than on rewarding/recognizing an exceptional workforce and providing them with an enjoyable environment in which to flourish. You are expected to do the work of 2 or 3 people in a short development cycle. The pace varies from frenetic to frenzied; meaning that everything has priority and it all has to be done yesterday. There is a lot of last-minute madness; therefore, there's a lot of stress. We haven't had raises in a few years and the profit sharing bonus has become something of a joke (this year we got half a paycheck after a year of juggling a truly insane workload). It was insulting.