We have a 2011 LD with 75000 miles on it. Been cross country 3 times and up to Alaska once. Only minor issues, two with appliances that were easily resolved. Yes, it is still a wood frame and aircraft-grade aluminum skin and paint. Yes, no slides.
One of the best things about having an LD is knowing that if it is cared for properly, if it becomes time to sell and is priced right, buyers will line-up and the rig can often sell within hours of placing an ad. People will fly cross country to buy a used one in good shape and infrequently will place a deposit on a used one sight unseen. This is not hyperbole, but rather the experiences of members of our LD club.
As noted by JT, not all LDs are perfect. That can be said of any RV. For more info on LDs, "join" the LD Owners site posted by JT.