I wanted to hear these libraries but was frustrated in my attempts to do so via the Custom Shop. After clicking on the image for the Cobham kit, I was entertained by a progress bar for fifteen minutes before I finally gave up and closed it. For $80 it would have had to be pretty special, but I'll never know.
I still think the Custom Shop is a brilliant way to sell stuff. But until there's been some serious optimization applied, I probably won't bother checking it again.