The company does not provide raw or verifiable data about the number of incorrect shipments or deliveries that encounter any kind of problems, whether major or minor. However, you can judge from reviews and general opinions in public forums that Amazon is at or near the 95 percent level of on-time, error-free shipment. Considering the fact that the company is the single largest retail seller on earth and that they deliver many billions of packages every year, it's an astounding and praiseworthy feat. Based on my own experience as a Prime member for several years, which is a sample size of one, I have only had one problem out of hundreds of items delivered, and the issue was the fault of a third-party seller. Even so, Amazon's customer service sprang into action and saw to it that I received a full refund in a short period of time.