This last book of the Wiz series is the best of the lot. In some ways it's a retelling of the first book in the series, with many of the same story beats, but it's handled better than the first story.
The comedic and satirical elements are done well, the plot is engaging, the characters are personable and interesting, and the world building is excellent.
The entire series is recommended, especially for anyone with a foot in the technology industries, and particularly anyone who is, or has spent time with, a programmer.
It's regrettable that Rick Cook was unable to write anything further in the series. His talent is missed.