Cash "Unearthed" C/D?

I'm pretty surprised I haven't seen many reviews of this set, which no doubt had to do with the impending holiday and also the lack of promo copies circulating. Perhaps because of the lack of reviews, I've also seen a lot of fans on the internet assuming incorrectly that the set is mostly previously released stuff from Cash's four "American" records. But, of course, the set is four discs of pretty good unreleased stuff, by no means dregs, and the packaging is great, too. I got it at Best Buy for a generous $52, which made it even better.

So, anyone else give the whole thing a listen? Thoughts?