To be honest I think it was whilst reading this book that I first thought to myself "Hey; I can relate to some of this."
I've got OCD and reading this book is always really helpful for me, so I'd recommend it to anyone with OCD, or their family and friends. The book isn't serious or angsty; whilst it deals with a really serious issue, the author doesn't spend the whole time feeling sorry for himself, which I've seen in some other books about OCD I've read. There's a lot of humour in this book-especially in the illustrations (my personal favourite being "Any last words?" "Yeah, can I just touch this gun 2-2-6-2 times?") and I liked the quotes at the start of each chapter too.
All in all, even if you don't have OCD or know anybody with the illness, this is a very interesting read.