We opted for a factory delivery. The RV had been gone through by the assigned tech. We found a few items that were addressed and received a significant education on the proper operation of systems. (not a salesman quick elevator speech). Also we customized some items to our liking, no extra charge.
The most valuable time was at the Factory Service department annual service for warranty work. After tha RV has been used for a year many items that are covered show up. These items show only after some use and would not exist at time of delivery.
We spent a week in Napanee as the Newmar Craftsman repaired, refined and improved upon the CanyonStar design. One item, very specific to my model, was a door motor mount for the ramp door needed to have its mounting surface reinforced. The fix was to disassemble the door frame and install a proper reinforcement as they might do on the factory assembly floor then reassemble the door and frame. This took the better part of a full work day. No charge to me. No dealer would touch this type of repair or, in the vast majority of cases, be competent to do it correctly.
This is a demonstration of why I purchased a Newmar and the value of the Factory Service center. BTW the doors works fine today.
Is this an expensive option, yes. In my opinion, as a new RV owner, it is worth the money, yes.