Pros
The starting pay for someone right out of college was really nice, especially if you work nights/weekends. Insurance benefits are really good, and 401k match is also really good. The cafeteria has a lot of options, and the company provides free breakfasts on Friday's (or a punch card for a free meal at a later time if you don't work on Friday's). There isn't really a dress code - you can wear whatever you want, within reason, including jeans (think your high school dress code). No need for business/business casual for most non-corporate people. Training/onboarding was pretty thorough for new employees, which helped people coming straight from college feel at ease.
Cons
They stress during onboarding that advancement opportunities are really plentiful - if you are in your current position for a few years and want to gain experience in a different department, you can easily apply for internal positions . It makes sense for most companies to hire from within, but my experience is that it would be easier to quit and either find a job elsewhere or reply at Regeneron from the outside than it is to apply as an internal hire. If you are hired as a BPS in manufacturing, at least in mid-scale, you will never leave. They know turnover rate for BPS's is high (because that's the entry-level right-out-of-college position) and they want to minimize that, but to such an extent that it makes employees extremely unhappy and a lot of people just quit and get jobs elsewhere. For lead/supervisor roles, it seems like the BPS's that are chosen for the jobs are chosen for their relationships to the interviewers (in a "pick your best friend for your dodgeball team in gym class" kind of way) rather than their merit, experience, or leadership abilities. This is incredibly discouraging. Mid-scale manufacturing (versus large-scale manufacturing) has, and continues to make, arbitrary rules regarding your ability to switch shifts or apply for lead/supervisor positions - you have to have been on your current shift for at least 11 months. This means that if you're placed on the night shift and find that it really doesn't work for you, you can't apply for a day shift position (even if it's open and no one else wants it) simply because you've only been on your current shift for 9 months. If you don't get along with your direct management in a way that causes you extreme amounts of stress on a daily basis, but you've only been on your current shift for 3 months, your only option is to quit or stay and allow your professional performance and mental health suffer as a result. They care more about employee retention than anything else, but don't do much to ensure that you are excelling at your job. Credit for successes is frequently given to leads/supervisors and above, even though the BPSs are the ones doing the work.