I've used him on an SV650s seat, which is the worst stock seat I have ever sat on. Before he fixed it 40 minutes and I was near agony. Afterwards, about 4 hours before I'd had enough. Was it as good as the Corbin on my ZZR600, not quite. But for the money it was a better value and I have a suspicion he'll be doing my 919 seat this winter.