We used it two years ago and it was worth the money. They rate very conservatively and are very thorough in their checklists and things. We were originally wanting to see a 2006 Carriage at a dealer not far away, but found it had a delaminated slideout and some water damage. Looked at five others that were on my 'list' from their online inventory and ended up settling on our Montana after two inspections. Hadn't come with everything to do a thorough one the first time, so we drove back a few days later.
The one thing just about any dealership won't want to do is put water in the fresh tank and let you look for leaks. We checked through all the appliances - found that somehow the antenna connector on the back of the 40" TV was broken off. The dealer got us a new one without any questions, but thoroughly looking through everything saved a trip back after purchase.