I didn't like the sound on this at all--the first RVG I have purchased where I was disappointed. The bass seems terribly underrecorded to me. Generally, I find a lot of variation from session to session in the RVG studio regarding the prominence and clarity of the bass, but this particular issue was the worst I've heard. Couple that with tape deterioration or some other flaw in the source, and you've got, in my opinion, real problems (aurally--the usual disclaimers about the music being otherwise great apply).
If we ever get a Mosaic Tyner box, perhaps Malcolm Addey will work some magic.