I heard about this cd on the Duke-Lym list serve and got it (at great expense) because it has a bonus track of the Ellington band doing The Clown with narration by Ellington and I've always wanted to hear that. That track is good but the bonus for me is the Mingus concert. There are very few recordings of Mingus between '65 and '70 and this concert is a great addendum to the Mosaic box set. For me it's even more exciting than any of the concerts on the box set.
The "great expense" is because it cost 9 Euros to get it from Europe via snail mail. One hopes that it will be available in North America soon. But for those of you in Europe......