What I also like about this book is that he provides the entire pgn of the game as the solution. I found some of the mates interesting enough that I wanted to play over the entire game to see how it got to the finish.
Unsurprisingly, the set A problems are pretty easy.
The set B problems were much harder for me. They are around Bain in terms of difficulty. There were 19 problems that I was unable to complete in under 15 seconds 2 of the last 3 repetitions, so I will do a supplementary revision with them.
Anyone looking for a first checkmate problems book should definitely consider this one.