To date I've listened to about eight of them and, while the musicianship is good, the recording quality is woefully inadequate, especially on the trio albums by pianist Johnny Griffith (not Griffin). Pianist Earl Washington fares a bit better on his albums. Trombonist George Bohanon's bossa nova album is far more bop than latin--a good thing IMHO--and there is a Jonah Jones LP that leans a bit too much in the Pete Fountain/Al Hirt faux jazz direction for my taste. But the real find is the set by alto/tenor saxophonist Lefty Edwards. Again, the recording is poorly done, but the music is fantastic. If only he'd been in New York with Rudy VanGelder, this one would probably have been a classic. On a set of mostly standards, Edwards shows a distinctive Frank Foster style, easily mixing swing and bop phrasing. The standout track for me is his interpretation of "Goodnight, My Love," his double-time work on the alto bringing instantly to mind Sonny Stitt.
Evidently Berry Gordy was able to entice some of the remaining local jazz musicians in Detroit to come and play on Motown sessions by offering them recording sessions of their own on the Motown Jazz label. It would be nice to see if someone could take the master tapes--assuming they still exist--and clean them up for CD reissue. Until then you can find the LPs on the fullundie music blog. While maybe not keepers, worth a download or two.