I attended one in Wilmington, NC. Larry does a great job and it was really nice to have working Yanmar engines on the floor to take apart and put back to gether. They had our specific engine, so we were able to really see everything up close.
I'm still no diesel mechanic, but it was well worth the time and expense.
Twenty years from now you will be more disappointed by the things y%^&*.....oh never mind. 90% of the people on sailing forums already use that as their signature! I'm not a conformist.