The thing that I like best is Zach's relationship with Aaron and Rachel. Aaron is a good friend (who has a cute cat), who supports Zach no matter what goes wrong. And a lot goes wrong! Zach has a crush on Rachel because she is fearless and brave, and she pushes Zach to work through his difficulties instead of giving up.
There are some graphic novel style pages in between chapters, and this is a big draw for readers who like books like Holm's Squish: Super Amoeba and Vernon's Dragonbreath, but want somewhat longer books. Zach is a fun character who would be right as home at a cafeteria table sitting next to Greenwald's Charlie Joe Jackson, Peirce's Big Nate, or Beaty's Dorko the Magnificent.