I picked up this book a few months ago when my neighbor was moving. He put stuff out on the stoop; I scooped this up immediately as I was going through some tough times at that point.
Dr. Hallowell is a great writer. He offers insight, tips, anecdotes/case references from his own practice, and lots of scientific information--without the reader getting lost in medical jargon. I imagine it would be kind of hard for a professional to tone down jargon, especially when it comes to doctors. But Dr. Hallowell does a great job with his very inclusive, calming voice. He also depicts himself as human, using examples of himself when he's worried to make him more relatable, and trustworthy as an author.
There's a chapter for almost every kind of worrying I could think of, and even little quiz to find out what kind of worrier you are :)