Pros
The people at the main office are responsive and will work with you on any issues you have. They recently switched 401(k) plans after some employees complained about the high rates on the previous one.
Cons
-The benefits are still pretty expensive. -Under our new contract last year, the base closure policy changed for GTS contractors working at my work site. Suddenly we are no longer payed in case of base closures for any reason, unless we take payed personal leave. We work alongside government employees who are payed, basically working the same job as many of them. I don't know if the change is unique to GTS, or if the government has decided to treat all contractors as second-class employees. The effect of this policy change has been, frankly, demoralizing.