Didn't see much in terms of benefits packages as an intern, but everything else about work was great. Work hours are flexible, you must complete a certain number of hours in the week, in any configuration during the week you like, so long as its within the buildings operation hours. They also are really good about encouraging work/life balance.
The overall environment was super collaborative, and helpful. I felt that I could always ask someone for help, guidance, or advice on a project as my research was unclassified.
Great opportunity to learn and work on cutting edge research, even if it wasn't part of my specialty.