I bought an "Elements" today at the La Mirada store. They are not stocking the Adco cover in the store any more. The Elements Tyvek was about $100 more than the
Adco CW online price and the side panels do look heavier than the Adco. They were all boxed up, so I couldn't see if they had a seam down the middle of the Tyvek roof panel like the Adco seam, which always failed before the fabric. I'll let you know in a couple of years if the Elements cover holds up any better than the Adco. They also had samples of the Elements "Premium" which appears to be all nylon, and costs another $100 more, but is not in store stock yet.
gp