Pros
Good solid company. Great work environment and people. The defense industry is slow moving compared to the auto industry, for instance, but it's the same at General Dynamics and all the others. Lots of contractors fill the teams - some good, some bad - like anywhere else. I wasn't there long enough to comment on long-term viability but BAE at this location was hit with layoffs after I left... then again, so were many other defense companies.
Cons
At the time I was working there they had terribly slow, incredibly inefficient CAD (Pro/E) data storage/management networking. I don't say software because I've used Windchill at other companies, but the infrastructure and networking setup between BAE and their other Michigan location was dreadful. I'm talking 20 minutes to pull a relatively simple assembly.