Chris Letchford Technique book (Scale the Summit)

Has anyone had a chance to use Chris Letchford's (Scale the Summit) guitar technique book??? I've heard a lot about it and wanted to see if any guitar players here could shed some light.

I just picked up their lastest album "The Migration" (I know this isn't the review section but) and it's absolutely amazing and now I'm hyped to get into some of Chris' technique books. Anyone else get a chance to listen to this awesomeness??

Cheers!