Pros
They provide lots of opportunities to learn and grow your career. They compensate well and have excellent benefits, including an amazing sabbatical program for every 5 years you stay with the company. They try to have fun and make the campus an enjoyable place to be. The CEO is very involved in the company's day-to-day activities, which can be a pro or a con...depending on the situation.
Cons
They pay well, but they expect a lot; the hours and travel (depending on the position) can be very demanding and often don't allow for a good work-life balance. Most employees have the constant feeling of never being caught-up with their workload...it's a constant struggle of re-prioritizing to handle the biggest issue at the time. It's a work hard/play hard mentality, and I felt that sometimes the "work hard" aspect was not justified. It's very discouraging to be directed to put a lot of time and effort into something only to be told later that it wasn't actually necessary.