There's not much in the way of bonus content on this set that hasn't been released on CD before.
The only thing of interest beside eight albums not being released outside of Japan before, is that all Japanese CD releases of V.S.O.P. The Quintet: Five Stars, their only studio album, used alternate takes of Skagly and Finger Painting. This is the first time the LP versions of both tunes are released in digital format (along with the alternates).