Ventajas
10+ years, and Jack Little - CEO and owner - is still the main reason that Mathworks is great. He's keeping it real after 30 years - still bickers over FFT coefficient matrices in the gym (yes, he uses the same gym we all do), will get involved when middle management isn't doing it right. When my five-year-old son was at work with me one day, our path crossed Jack's. I stopped Jack to introduce my son to the man who built the company, and Jack (sole owner of a company of 3000+) stopped, got down on one knee, and engaged with my son about how his day at Dad's work was going, and did he have any questions. How many CEO's would be in the hallway with the unwashed masses to begin with, let alone be late for a meeting to talk to a peon's kid. Very stable - privately owned, long-term vision, and the $$$ to follow through on plans, even if the first year (or three) look bleak. If you can put up with the political, quasi-academic B.S., you could retire from Mathworks.
Desventajas
Very silo'd and very political - the experience you have will depend entirely on the manager you have and the group you are in. And don't even try to go up the food chain to change something - you'll bump into the "golden children" and be sorry you did. No accountability for the "golden children" that have been there 20+ years. They are above rules and norms, and pretty much what they say is the law. If it's wrong, someone else's head rolls. As a "new" employee (even after 10 years), go with the flow, or get out. Campus is in Natick - it is isolated, difficult to get to, and in the suburbs. Telecommuting is against company policy, so learn to love Route 9.