Great company - left due to some slightly bad luck
Pros
I was free for almost the entirety of my time at MStar to propose the best solutions to problems, and then apply those ideals to what could actually be accomplished within business constraints. Great colleagues within our division and across the enterprise. Senior management was always supportive as well. For entry and mid-level staff you won't have problems building a career here - for more senior folks, as always, there has to be a little luck as well, for the right position to be available at the right time. Comp and benefits are more than fair, and the work is as challenging as you make it.
Cons
Can't think of any except to ask potential colleagues during the interview process about their direct management chain. 95% are great to deal with. If those folks are happy, and you're willing to work hard, you will likely be, too.