Some of the policies and stuff are the same across the industry due to restrictions in the government contracts. You will likely encounter a more bureaucratic and strict environment compared to other companies.
Pay and benefits are generally reasonable from what I've heard. I think they are falling behind on benefits compared to the PTO, student loan repayment, free food/perks, and paternal leave offered by others.
Top secret SCI clearance can take time due to the investigation, so expect some delay.
It was a long time ago, but I think it was one of the most formative periods of my career, and gave me a jumping off point to greater things. And I met some of my best lifelong friends there.
Of all the things I might have changed about my career, that period is probably the one I would change the least about.