A month and a half ago I scored both books on large discount from our local Borders branch that was closing. I started with 78 Degrees, and found it very good. I've just started reading Tarot Wisdom; I've gotten through the introductory chapters and the Fool chapter so far, and I'm enjoying it very much. I like the comprehensiveness and the increased detail. I think the books complement each other; if you're lucky enough to afford both, I'd suggest reading them in the order written. My copy of 78 Degrees, BTW, is the one-volume revised edition; I understand that when it first came out it was in two volumes.