Got my clutch hub back from John this week and fitted it today and as others have said it makes a big difference- my bike (2005 with 35000 miles on it) before having it done it rattled like hell on tickover when in neutral, it doesn't make any noise at all now-vast improvement!
And the vibration/juddering has completely disappeared didn't realise how bad it was till having this done.
So big thanks to John @ vibefree for doing a great job
cheers Colin