I got it and have listened to the whole set.
It's good. Bennie Maupin (ts, fl, bcl) is really awesome and almost steals the show. I had practically no recordings with him before this box. Harold Mabern (piano), of whom I'm a fan, is also strong; perhaps some solos are overly long and rambling, but that's part of live sets. Jymie Merritt plays electric bass, but no complaints about the sound (my taste runs more to acoustic).
A guy on a jazz forum had a good description of the music: "...think of it as the missing link between Lee Morgan & Music Inc. or vice-versa".
Do I need 8 CDs of this material? Rationally, probably not. But it's an important archival reissue, less than half the price per disc of Mosaics without the unpleasant (IMO) bulky packaging. There is a fine booklet, approx. 5+" square as opposed to Mosaic's 12"x12". I'll happily take that in exchange for reduced shelf space, don't care about fancy photos.