I'm not a federal employee, but a "beltway bandit" at a government facility. The government benefits are pretty par with civilian, vacation is possible better, but they have pretty strict limits to what you can hire someone for.
I hire most of the people under our contract. Once they have worked there for a while the government can hire/transfer the people in at a comparable salery by using their current salary as a "comp".
Be aware, at least around here it takes a good 10 months to get a government offer letter out.