FWIW I have been following Stephen Peel's perambulations when I've had little to do(and really should be doing better things). His Roholff hub seems to be playing up...or something's gone wrong. Sheesh. I thought these were tried,tested,gold standard. Shome mistake on this one,perhaps. A lemon? Can't think what's going wrong...and if I was given an exploded diagram of the internal mechanism wouldn't be able to understand it,but....£4k spend on a bike that's spluttering after the first 200 miles doesn't augur much faith. Better the old and trusted derailleur maybe. Hope he paid for his machine by Credit Card!!