Pros
I was in the aeronautics division. The 9/80 schedule was a plus and most mechanical engineers were given 1-2 work-from-home days after the pandemic. GA-ASI was a good place to learn about big company processes like SAP and design reviews. Some groups like engines and airframes were more well-funded in R&D.
Cons
Aeronautics groups not belonging to engines and airframes seemed to settle into a strategy of doing the bare-minimum rehash of old technology. Opportunities for long term technical advancement might stagnate as a result. If you're okay with working the same type of problem every year, GA can be a good place. GA is not the best environment for design engineers who want to work on a variety of projects and exercise some creative freedom. Pay raises were not competitive until after the pandemic when engineers were leaving en masse for better opportunities. Some managers were only there to coast to retirement, uninterested in developing their team. I was fortunate to eventually transfer under a good manager and stayed as long as I did because of it.