Avantages
MathWorks is full of hard-working, interesting, fun, extremely intelligent people who constantly challenge themselves. The company genuinely cares about its employees; the company's ethics (for example, the way everyone in my group takes the time to say "thank you" at least once a day) and benefits/perks (such as fresh fruit in the morning, and counseling services) reflect an incredible commitment to the well-being of the staff, and to ensuring that they're not only happy in their jobs but happy in their lives. (This is also reflected in the volunteer program and Social Mission, by the way-MathWorks' commitment to community and service was another big indicator for me of how good this company is.)
Inconvénients
Commuting to the Natick campus from Boston can be a bit of a pain, especially if you can't drive and have a long-term injury or surgery. While Boston's MBTA provides reasonable service, they're also strapped for cash, and the MetroWest Regional Transit Authority (operating shuttles from MathWorks to MBTA stops) is unreliable, disorganized, and overcrowded. The company has a very strong commitment to on-campus, in-person business, which makes for a great and productive working environment, but it also means that working from home is not an option for extended periods of time, even with a doctor's note.