I like this book.
Despite its super casual tone, or perhaps because of it, this book really says a lot of things in a very simple way. The writer has a "cut the BS" tone that's really refreshing for someone writing on the occult who often try to come off as super mysterious and abstract. The author explains deeply esoteric concepts in a very simple, straightforward, and direct way. At numerous points I found myself saying "Oh, THAT'S what it meant"
His explanation of the Emperor/Tzaddi/Heh thing is probably the most simple I have ever seen while his explanation of all of the trumps ring with an element of practicality. The best thing about this book is that it sets you up to read other stuff. Once you understand what's being said in this book, the Book of Thoth becomes considerably easier to understand.
My one issue with this book is how the writer tends to go on long rants that come out of no where, some of which (like in the commentary for the Knight of Disks) almost have nothing to do with the card being described. That's my only issue with the book.
Beyond that though, I would gladly say forget Duquette. If you're just starting with the Thoth and you want a more down to earth look at the cards, pick this book up instead and then go to the Book of Thoth. I wish I would have read this book first.