Pros
1) Good compensation compared to other companies of its size 2) Nice facilities, decent cafeteria 3) Nice location 4) Relatively quick setup of laptop and network access 5) Can retreat into "touchdown" offices to focus on work and get away from the never-ending office politics there 6) Company occupies market niches that few other companies want to deal with, so it has little in the way of competition.
Cons
1) Middle management hopelessly inept and feckless - there is no adult supervision there. 2) Obsession with consensus-driven decision-making means that decisions are either never made, or they are made by the pushiest, most obnoxious people on your team. For some reason, this is generally thought of there as "collaboration." 3) If the decisions don't work out, the wrong people are usually blamed for it. 4) If the decisions don't work out, you are expected to be a "hero," and work day and night to make up for the bad decisions. Here's a hint: most of their decisions don't work out. 5) Company politics is hopelessly byzantine; it will take you months to figure it all out, especially with all of the warring cliques there. 6) Company flits from technological fad to technological fad, without any real innovation or technical vision. 7) If you are in the least bit nice as a person, you will be viewed as weak and eaten alive (figuratively speaking, of course).