I purchased the Donal Byrd Blue Note Collection. 5 CDs, 10 complete albums. Have not played it yet It's not a BN release! A Label called "Enlightment". Help me Jesus.
I have the Three Sounds set also. There is nothing wrong with the sound, they just aren't as good as we remember them. Anemic sound. Of the box set crowd, "Chrome Dreams" and "Real gone Jazz" seem to be reliable labels. And anything by "Rhino".
I think I have all the Morgan and Silver I want on separate CDs. Although if I were just starting out, the boxed sets would be the way to go.
The Classic albums sets are good to get, for artist of which you have almost nothing. If you don't already have them, then they are probably not top tier guys, so the box set is a good way to get all of their stuff that's worth having with one buy.
The Amazon reviews are usually a good source of info on sound quality. Just disregard the reviews from 'audiophiles'. Nothing is ever good enough for them.
Cheers