Instruct: Classify a given Amazon review as either positive or negative.
Query: Not the best introduction to magnetic materials but a good reference

Cullity has written a good reference text on general magnetic materials, but I do not think this should be used as an introductory text. The revisions make this a much improved text compared to the last edition, with numerous new figures, sections, and updates. However, I find that Cullity's approach, which is very technique-centered, is somewhat for the beginner to understand. That said, this is a good reference when choosing characterization techniques.