I think that anyone who uses, or is thinking of using, gear should own a copy.
William LLewelyn has provided an exhaustive look at Anabolic Steroids that is without parallel. He's a great writer, and is incredibly well informed. If you read his articles in Muscular Development, you also know that he has the ability to condense complicated topics into a concise, readable format that is easy to understand. We are very fortunate to have his occasional input here on getbig.