I'm not from the states and didn't knew about Howard Stern. I saw him on Colbert's Talkshow and the book sounded interesting.
I have to say, it was an fantastic read and almost had to force myself to stop reading to get some sleep. I don't know if it would be equally interesting for his regular listeners. A lot of it consists of transcripts of his interviews and a short commentary in front of it.
The best part about the interview's was the part where someone told a story about another comic or actor and a footnote you could jump into a follow up interview about the topic with that comic or actor.
Overall it was a great read and I can recommend it to everyone who wanted to to know a bit more about personal and more humane stuff about some celebrity's and Howard Stern and his growth to become happier person.