Obviously I'm biased since I loved this book when I was younger, but I still enjoyed it years later. I thought the beginning was a little weak (and not a huge fan of the stereotyped gym teacher) but I quickly became absorbed in the world. I love comfortable adventure stories that at the same time aren't cliche or tired. Mister Monday had a lot of high notes that I think separate it from low quality fantasy books. Now that a lot of the set up has been done for the world of The Keys to the Kingdom, I'm even more excited to read the sequels.