Pros
Decent pipeline of products, some collaborative hard workers, free food, nice campus. I've met a lot of great people both professionally and personally who will be lifelong friends.
Cons
I contracted at REGN for over two years in 2 different departments. One worse than the next. Incompetent, fake managers and difficult, demeaning, backstabbing and lying team leaders who do not have any concern for the professional development of temps. The "carrot dangling in front of the face" analogy is a good way to describe my experience working at Regeneron. As a contractor, you have the same exact expectations as full-time employees, without the additional benefits or perks. I would highly recommend avoiding Regeneron unless you can obtain a full-time position.