Pros
Day-to-day perks, like cafeterias with very good food, fitness centers, on-site wellness center, Zen Zone with sauna and steam room, company subsidized massage and acupuncture, social events with lots of food and beer. Beautiful facilities, especially Feynman Center and Agora Building. Access to Woods Hollow Children's Center, if you want to drop a ton of money on having your kids close by during the day. Good place to be non-management. You can have a long and happy and very secure career if your ambitions are modest.
Kontras
Promega has a difficult time getting rid of people in leadership who are toxic or ineffective. I'm aware of two who were the primary reason at least 10 really high performing people left the company and there were several more that were on the verge. That's unacceptable. The first was finally let go after much too long a process, despite constant and consistent feedback from his direct reports. The second is still there, and is easily the most toxic person I ever worked with. People universally talk about her with this sense of disbelief that someone so awful could still have a job. It's a problem, and it's amazing the company doesn't address it more promptly. The self-funded medical insurance is crazy expensive and doesn't cover as much as previous insurance did. Compensation is pretty lackluster, opportunities to move up are scarce, and the closer you get to working with Bill, the more you are at the mercy of his current opinions, which seem to change pretty frequently and often lead to people being let go. There's little sense that he trusts his leadership team, and he still operates in the details of entrepreneur mode rather than the vision of CEO mode. This whole thing with the Usona Institute is also fairly baffling that he allows there to be any obvious connection between Promega and a place that's exploring hallucinogenic drugs. It'll be interesting to see what happens to the company when he finally retires.