Sonic Boom is one of those albums I don't play that often and when I do I am always struck at how good it actually is. I played it last night and re-reading my comment above, I would probably have phrased it a bit different (hey, what are you doing now then couw?) The 1969 sextet session will certainly sit better with Sonic Boom as both have a much more extrovert character than the original Procrastinator. That is actually why I think many of us were enthusiastic about the idea of combining the session with the Sonic Boom reissue (this idea was born on this board and brought to Cuscuna by Kevin, alas proof no longer exists as the thread got deleted).
It deserves to be heard, but it won't change your world. As Jim rightfully points out, is in Rajah land with other "lost sessions" like Taru and Standards. Unlike The Rajah and Taru (which I find a very uneven album with nonetheless great tunes), there are no sneeky little gems, like The Rajah's "A Pilgrim's Funny Farm" and Taru's "Haeschen." It's more like the equally nice-but-not-outstanding Standards date in that respect.
Of course all this comparing amounts to nothing as I could easily attack my own assesment above. (What do you mean? You think there's only ONE good song on Taru?? ermmm.. no, of course not it's just that --- )