There's a pretty huge thread at the Steve Hoffman about these as well as a smaller one at vinyl asylum. Opinions seem to be split around 50-50 or possibly 60-40 in favor of the box set over the DCC's or originals.
In light of the fact that the box set has been manipulated digitally, I have no interest in it. I have originals or early re-issues of most of the albums and if I want any others I'll seek originals of those.
On top of that, there have been huge quality control issues with the box set.