Thus far, my experience has been good. There was a minor bureaucratic snag in the first couple of days. A lack of coordination left me computerless, but I found some pertinent documentation left by my predecessors and went through it for a couple of days so I wasn't completely at loose ends.
I spent some time interacting with some of the contractors involved with what I ought to be working on, which was useful.
My immediate colleagues seem like nice folks. A couple of long time guys and another new analyst from my same school (different option; she studied chemistry).