I've spent a few evenings going over this material. There is some really nice stuff in this ebook, and Mike does a great job of teaching it.
What Bill refers to as the "Harry Potter embedded moving pictures" is a feature of the current version of Adobe Acrobat. You can have small video clips included on the page as part of the document. So you can read the description of a move, and look at the pictures, studying it in the usual way...and then you click on the movie clip and see Mike do it. If you didn't see this in "Closely Guarded Secrets" then you don't know how effective it is.
He teaches some really good work on several classic palms (two methods of the Erdnase Bottom Palm, the Hofzinser Bottom Palm, a Marlo Delayed Action palm), and the Gambler's Cop; plus he tips his own technique for the Bottom Palm for the first time. Mike's approach to the Bottom Palm hides the move under natural motions and is extremely efficient...there is just no wasted movement. Even if you're familiar with the other palms, I think this part is worth your time.
I should also mention that Mike is really, really good at these moves. Several times I read the palm, stepped through it with cards in hand and looking at the pictures, and then clicked on the video clip to watch him do it. And he got me...with the technique I had just worked on. Dammit.
So you'll be learning moves from a guy who really knows how to do them. And he makes sure you know exactly how to do them yourself.
This one is worth your time!