I've used a dozen or so puzzles from the book at this point and I love them! The average difficulty puzzles are just challenging enough to make my players think for a minute (Door of the Unlucky stumped them for like half an hour though, haha).
The digital version of the book has labeled bookmarks for each puzzle (super helpful), most of the puzzles fit on a single page or less so they're easy to grasp and implement, and they're very creative. I also like the suggestions for ways to customize the puzzles and which other puzzles they might go well with.
[5 of 5 Stars!]