Positions there are fairly secure as the company continues to do well and grow, although there wasn't a clear career pathway outlined when I was there (I think it may have changed now), so there really didn't appear to be much upward movement possibilities.
Worked in manufacturing in the clean room for a year and a half. My manager was awful. Condescending and rude, lied about overtime pay, had no experience in the clean room so was completely useless on top of the fact she didn't take suggestions from the employees actually performing manufacturing duties, and in general a real buzz kill. Easily the worst manager I've ever had.
Most of the people who work there are great. Salaries are not that high to do the status of the company being a desirable place for science-based work. Company culture is good and benefits are also fine.