A cute little book filled with pretty common sense advice. It's an easy read, but not really all that profound or ground-breaking.
The basic advice in the book is "don't worry; it's not that bad". I see how this may be beneficial for some people with normal day-to-day anxiety, but definitely isn't helpful for someone with any anxiety disorders or people who have to deal with constant high-stress situations such as discrimination.
The target audience seems to be very limited: middle class people that have occasional stressors but overall don't have any big problems.
The advice may work for some people, but personally for me it takes more than someone telling me to stop stressing to actually cope with anxiety.