I can't agree. I downloaded several manuals and received a wealth of information, never thought I was being taken advantage of until the site went down.
I "invested" in a membership once to help a customer unload some spare parts he owned for a boat that burned and sank.
In that time, I not only did not have a single inquiry on the "for sale" but I had a lot of premium access to the site. I looked at possibly downloading specs or brochures, and there wasn't a single thing they offered that wasn't available across the entire internet for free.
The other piece is that their forums were the same as forums everywhere. A few really experienced people who could help someone. And dozens of well-intentioned people that repeat what I would call "plausible bull$#it." It sounds good, seems logical, if you don't know any better. Unfortunately most of the clients couldn't tell the difference.
I never had a personal go-round with Tony Athens, but he definitely uses the program.
One of my customers paid him for advice. Because he doesn't give it for free, and discommunication being a thing, he seemed to think that a CPL number was the same as a calibration spec. I'm sure it was the customer who queered it all, but who needs to go to war with the Cummins god?
Boatdiesel created more problems than they solved and they charged a premium for the disservice.