Flat Mount Paul Klampers - any good?

Anyone use 'em?
I have a bike dilemma, and might need to do some swapsies with frames and groupsets. Got a Chorus rim brake groupset which could really do with being fitted to a disc frameset... Anyone tried the flat mount Klamper (particularly with Campag levers)?
I've tried PM Klampers on an mtb before and was fairly impressed, but I don't like Spyres/BB7s etc...
Would be good to hear your thoughts before I splash the dosh