Azdel or not?

I keep seeing so many stories about fiberglass walls delaminating and the such with luan as part of the construction. I see people who don't even have water damage and the walls are coming apart. So, would you only buy a trailer that uses Azdel or is there good reason to buy one that doesn't have it because the manufacturer has a superior reputation for wall construction and longivity? I realize that there are a ton of factors at play, I'm speaking generally. I haven't kept one more than 3 years and I seriously doubt there's a manufacturer that would stand behind their walls for 5, much less 10 years.
Some highly praised names don't use it, such as Grand Design, Northwoods, Outdoors RV, etc.
Sales people in general won't trash talk either if they have both kinds of trailers in stock. If they only have one kind, well, you know it's the best.