I have not read the whole thing, but already it's hitting a lot of buttons. A central story revolving around investigating the headmaster's disappearance, a five-tier encounter framework using different sets of monsters in dungeon rooms depending on average party level, and expanded rules for school life which give consequences if the PCs sneak off too much at the expense of their studies (and vice versa if the mystery isn't solved in time).
Adding to this is the fact that the module is made with the Spheres in Power system in mind. It is a worthy alternative to the standard Vancian system of magic, where spellcasting is both more balanced and allows for a wide variety of character concepts. The contents are available as a free online wiki, and I've been running two campaigns with it. So far sphere-using PCs held up quite nicely in adventures. While this may be a turn-off to those who prefer standard Vancian magic, the self-contained nature of Wizard's Academy can make for a nice one-off to test out an unfamiliar system.
Overall, I like what I see so far, and this book has yet to disappoint me. I recommend checking it out if you're a fan of the magic school campaign style.