This book, by Malcolm Gladwell focuses on the first two seconds of decision making.
It was a really interesting book. It gave a lot of examples of these types of decisions and how they can be just as good, if not better than, well researched and investigated decisions. To be unbiased he also gives counter-examples on how these can go astray and what may cause this to happen.

He left me feeling like this is great to know, and I want to trust my snap decisions more. However his counter-examples convince me that they can still go astray, and he fails to provide some way to reconcile this issue of knowing when to trust a snap decision and when not to.