Jumping at Shadows: The Blues Years

[Jyqm]

Oh boy. I've never posted on The Ledge before. But I've got a question, and AMFM has been all but dead for a while now, so here I make my debut!

Anyway, I've been in a very bluesy mood of late, so I've been listening to lots of early Mac and wondering if my collection needs any expanding. (Can one ever have enough Mac?)

My question is about the two-disc compilation "Jumping at Shadows: The Blues Years." Does anyone know anything about this set? On first glance, most of the Fleetwood Mac material appears to be stuff that's already been released on Vaudeville Years, Show-Biz Blues, and the Boston Tea Party discs. Am I right? Is this all stuff I already own? Or are these different versions that I should really check out?

Thanks in advance for any help!

-Jyqm