These are pretty exciting in the Dead trading world.
For those who don't know, Charlie Miller has provided the Dead's fabled 4/26-4/29/71 run as new files directly from the 2-track master reels. A couple things to note:
1. Charlie's notes indicate that the reels were baked and transferred by David Gans. This is important not only because Gans knows what he's doing, but also because he is in a position to know that these really are the masters. It's not uncommon for a new fileset to be trumpeted as a master reel set but to sport an obvious generation or two. Not so here.
2. All three are available in either 16/44.1 or 24/96 filesets. This is huge, as they are some of the first real landmark shows to truly warrant the 24/96 treatment. I always download the bigger files when they're available, but it's not often that the difference between 16/44.1 and 24/96 is that obvious when we're talking about first row balcony master audience reels from 1980 or something. With these filesets, and especially with 4/29, there's ample reason to choose the 24/96.
3. The patches are great. They are apparently taken from Rob Eaton's 16/44.1 DATs straight from the 16-track masters. These shows have always been plagued by questionable patches or obvious tape flips in cringe-worthy places. All better now.
4. The pitch correction seems to be spot on. IMO, Charlie struggled somewhat at pitch correction when he first made it part of his SOP, but these sound perfect.
Anyway, that's what I've gleaned based on a couple quick listens. To be perfectly frank, 1971 isn't my favorite year for the Dead, as the shows lack both the exploratory qualities that make 1969 my year of choice and the jazzier elements that make 73/74 so damned much fun. But these are most definitely worthy of your valued can time. :-)