We crawled all over ours, under ours, on ours, in the closets, on our hands and knees and on anything we could stand on.
We were at dealer for 8 hours, and left, came back a week later and they had most of the stuff fixed. Most were minor repairs.
Take along a digital recorder or video camera, record EVERYTHING that is said by that salesman or whomever does the PDI with you.
Hint: the valve to pull the galley water is hidden and is something that comes up here at MOC a LOT!!!
Ask to be shown the 3rd handle. It is NOT in the convenience center, it is usually under, near the tires, close to where your kitchen is on that particular unit.
And, as said here before: Enjoy the experience! and the new Montana.