Working at a national lab or NASA and your experience?

[CountZero]

I am currently beginning my job hunt for a 6/2007 graduation with a MSEE and I was wondering if anyone on the boards has worked at any of these places and feels comfortable sharing your experience for good or bad. Particularly compared to working in industry if you have experience with that as well.

I've worked in industry at both a very small company and a very large company but I'm not sure how these other possibilities differ.

Thanks!