I have a half-dozen dual discs, and i don't have a DVD-Audio player yet. I bought them because the dual discs don't have the stupid copy protection that the regular CDs do, and for a couple, it was the only way I could purchase them. So far, no problems in my Sony SCD-1 which is a top loader, or in my computer. To protect the DVD side, I've made copies of the CD layer and generally play the copies now.
I'm surprised the Ayre unit has trouble with them, I think I'd contact Ayre and see if they can help with this.
Also, I have no information that suggests the CD layer should, from a technical standpoint, sound any better than a standard CD counterpart. If the CD layer does sound better than average, I'd attribute that to the better than average mastering of the product in order to justify the superior digital characteristics of the DVD-A layer.