My full review is here on my personal website. I'll post a few excerpts here, though:

4.0 out of 5.0 stars

The very worst thing about this book is that even after everything helpful he has done, Artemis is still mindwiped. Granted, he caused a bunch of these problems, but still…

The very best thing about this book is how, even though Artemis is a genius, he still doesn’t think to make sure that his super cube won’t accidentally leak fairy information. I really like his random mistakes. They make the character come to life because no one wants someone who is absolutely perfect.