Hm. I thought I'd be all over this one when it was announced, but looking at what's included started me thinking. I have a cd issue of the Town Hall Concert, the 2 lp Ulysse/East Coasting 2 LP set, the original 2 lp Jazz Workshop issue of Mingus at Monterey (plus a 2 lp Japanese reissue of same), and a Japanese lp reissue of My Favorite Quintet.
So it looks like there's about an hour and 40 minutes of music I don't have. Tough call if I want to spend $102 + shipping, not to mention the space that the Mosaic Box will take up.
Earlier on in my life, I'd have gone for it without thinking. Now, I'm not so sure.