The only time I have ever heard Nick Harper was when he played Cropredy (2004, I think), and all I can recall is that I absolutely hated it!
I thought he was awful at Cropredy, the Zappa song didnt help, but I have enjoyed him every time since.
Glad to hear it wasn't just me, but maybe I will give him another chance if he comes near some time. Not that I think I have had to go far out of my way to ignore him in the past 20 years...
