I like the new mix. I can hear instruments I didn't even realize were there, the midrange squashing of the Lord-Alge mixes is gone, acoustic guitars are crisp instead of wishy-washy, and some of the songs - "Darlin' One" being a good example - are transformed for the better. Everything sounds airier and more open, more like a band playing the songs rather than a track-by-track build (even if that's how it was actually recorded).
If I have any criticism of the box set, it's that a lot of the extras aren't of any real quality, and they might have been better off just releasing the new mix as a single disk. But I have zero issues with the mix itself.