Several of us investigated it a number of years ago and concluded it was more work than we wanted to invest. Can't recall specifics except to say it was very, very detailed RPG that allowed for miniatures. A lot of backstory and faction-fluff that factored into the game.
Solid, hyper-realistic premise of survival/combat in PA world. Obviously a massive labor-of-love from the developer, but something other game systems accomplish much more efficiently, IMO.
Although it might be a fit if your group is into long-term, realistic RPGs.