The George Mitchell Collection on Fat Possum - C or D?

Been collecting a few of these singles and sorta wanna take the leap and buy the box set - 7 CDs for under $40.00. How much of this stuff is just so-so? Anyone have it? Seems like a pretty awesome collection and a really good price.

Am interested in it but don't have it.

Have the Leon Pinson, John Lee Ziegler, Robert Nighthawk, Houston Stackhouse, Big Joe Williams, Buddy Moss and Jimmy Lee Harris singles from this collection on repeat all night. Pity no one on ILM ever wants to talk about blues.