Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An exhilarating read!

DEFENDING THE UNDEFENDABLE is an exciting book. Dr. Block applies familiar libertarian principles in the most unexpected and innovative ways. I began reading many chapters in disbelief, while concluding as a loyal convert. It was awe-inspiring to observe the brilliance and clarity of Block's step-by-step logic unfolding, with him taking me through an intellectual journey to its ineluctable conclusion. If such "lowlifes" as libelers and slumlords rank near the bottom of your pecking order, you're in for an exhilarating read!