This book had some good practical advice for dealing with sensitivity. For example, the tips around blocking out sound with headphones/earplugs has been really helpful for me in the week since I've started reading this book. There were a lot of things I was already doing instinctively that I am now conscious of - in a positive way, because I can notice when I'm doing them and assess if there's anything else I can do.
I also appreciated that the book was fairly gender-neutral - something unusual in self-help books today, let alone ones written 12 years ago!
However, it fell over in a lot of ways: - It sorely needs an update - the world has become even more saturated with stimulation with the advent of smartphones. - It leans very heavily on unproven (or, in some cases, disproven) modalities such as acupuncture, flower remedies and homeopathy. - Even though highly sensitive people (HSPs) are more likely to suffer from anxiety and depression, it doesn't talk about how medication (such as SSRIs and SRNIs) can be effective in combination with therapies like cognitive behavioral therapy (CBT) and acceptance and commitment therapy (ACT). (ACT was still pretty new when this book was published - another reason it could use an update.) While it's not for everyone, it's still something I think people should be aware of - medication and therapy together have helped me immeasurably. - It treats HSPs as these delicate flowers that need to be constantly coddled. It's useful to understand your needs and advocate for them, but I also think there are some times when you need to endure difficulty. The advice to just work less seems to come from a place of privilege to me - and I say that as someone who has decided to work less for my mental health. No way I could have done that if it weren't for my sizable savings and my wife's full-time job.
Overall, the book has some good suggestions and is worth reading if you want some practical ideas. But read it with a critical mind, and do your own research (including talking to a trusted medical professional) about alternative treatments.