Really a great price too... I think even if you spent a lot of time searching for "free" kegs, cheap parts, etc. you would be hard pressed to come in much lower that what he is asking-- the upside is this is done already! Ferm chamber? Check. Kegerator setup? Check. Grain Mill? Check. Well designed and implemented electric system and control panel? Check? Quality vessels? Check.
Seriously, for someone close, I would not hesitate on this.
Good luck to the seller!