A very good book to understand and change habits. Especially the appendix is very useful to figure out how to use the book practically.
I found chapter on free will, habits and ethics very interesting. And I totally agree with the conclusion drawn by Duhigg.
Some chapters such as society's habits are an overstretch in my view since it is too much of an simplification to use habits to explain what is going on in society. There are many other factors involved.
As a side note Charles's writing style is very riveting. He is good at storytelling. I never got bored while reading which very rare.
