Overall a well written book that contains a wealth of information that can help any new entrepreneur form a solid plan for the new startup.
Most people adamately defend their opinions or ideas on nothing more than their personal, and very emotional BELIEF that it is right. The lean start up provides a way out of that subjective platform of decision making.
The lean startup as a whole is quite lightning it connects concepts that date back to the early part of the 1900s and creates application that is as relevant today as ever. Additionally I like the meet ups and the other resources that are also available from this book