OK - the OJCs are fine. You should be aware that this box includes the following Jaws/Shirley Prestige LPs
Cookbook vol 1 (an alternative take of "But beautiful", of which I wasn't previously aware, and not listed in the 1978 Prestige discography, is included)
Cookbook vol 2
Cookbook vol 3
Smokin'
Jaws
and
At ease (MV) - but one track from this LP, "Man with horn", has been omitted.
Pricewise, this looks to be a better deal than buying the OJCs separately. The tracks are set out in order of recording with the exception of one track (WTF?!?!?!?) Prestige issued this material in a most higgledy-piggledy way (a frequent practice), so I guess one can get a different perspective on these classic sessions.
"At ease" was recorded 31 Jan 1960 and must have been released early in that year, so it's only just come out of copyright.
I dare say the stuff has been copied from Prestige CDs, so the sound is likely to be good.
MG