Always 2 sides to every story...
The clutch i was supplied is certainly nothing to worry about, looks pretty bloody solid too me!
Pics in here - http://www.skylinesaustralia.com/forums/topic/358438-34geeteetee-daily-track-project/page-21
Yes Jim reads the forums and he is not afraid to have a chat and explain why certain failures happen, neither of the ones i know about give him anything to hide from.
I am sure people like PJ etc would be someone to ask about JB clutches as it is one of the most well known cars on the street and has no issues.
Mine is so nice to drive with and cops a punishment, holding up with over 500rwhp no worries.