thanks for the advice so far
i dont know how much they normally go for, the concept model is slightly rare and doesn't come up very often. there was one a few weeks ago, but it was refinished.
wez has a point about the guys experience - he says 'there are some scratches on the fingerboard', maybe from the fret work hes done? ok, necks can be fixed, but for a price... might be worth buying a different guitar.
as philly says, its a kind of gamble.
hmm, i'll wait for some more opinions