Pros
Working in the Flatiron is cool to tell people, and people think it's a prestigious company and industry (even though people confuse Macmillan with McGraw-Hill all the time and always ask if you work in academic publishing when it's trade). Free books.
Cons
Where to begin-- poor pay. Starting salary for assistants is still $28K, which is much less than other companies. Management lies and says it's easy to move up or to other departments, but it's very cliquey, and if you don't know the right people that will never happen. Benefits are awful-- they just changed to a different plan to save the company money but didn't consult with employees about it. A lot of people had to change doctors that they had been going to for years. The building is falling apart inside. It is poorly maintained, which makes you feel great about going to work when your desk is coated in layers of dust and the walls are scuffed and gray with lack of paint. How do customers/clients/business partners take you seriously when your building and fixtures are so gross. And there aren't enough conference rooms, so you're always trying to find one. The management buys second hand furniture for everyone except the executives, so it always looks like your office is a college rec room full of Craigslist purchases. Also-- there is very little communication at different levels. Some of the leadership are incompetent and don't know how to do basic computer functions. If you're thinking about working here, definitely reconsider.