Life is too short to be mediocre. Collin's researchers do a great job showing how choosing to be Great takes as much energy or less than running with the pack.
I found that the logic and studies behind the formula for good to great, I especially liked the points on pay, what type of leadership is best for a company, and the role technology plays.
If I had one complaint it would be about the flywheel concept, firstly not explaining it at least briefly earlier, and secondly it seems to be a dangerous concept when you don't have a way of checking your progress and making sure the path you are on is the right one. I would have preferred some more info about how to test if you're on the right path for your company.