Yes, I own it and generally I like it. The performance is very good. I must say that I find some of the newer Ducal compostions on it not quite as substantial as his earlier works (eg. The Great Paris Concert from '63, probably my favorite live performance by the Ellington band).
I agree. It was a good concert (I wish I had been there!), but it's not among my favorite Ellington albums. The version of "Rockin' in Rhythm" is very hot, but not quite as good as the Paris version. Part of the difference, to my ears, is that Rufus Jones wasn't as good a drummer as Sam Woodyard.
I agree that Rufus Jones is not as good as Woodyard. Still, to me there is a soulfulness to many of the performances on "70th Birthday Concert" that really appeals to me--including Harold Ashby's solo on "B.P.", the ensemble work on "Things Ain't What They Used to Be", Johnny Hodges' solo on "Black Butterfly", Norris Turney's flute playing on "Fife" (although the song itself is rather slight), just to name a few.