"Mad Diet" appears to have mixed reviews. Some customers have praised the company for its products and customer service, while others have expressed dissatisfaction with the customer service. The products themselves are described as decent in quality. On Amazon, the book "Mad Diet: Easy Steps to Lose Weight and Cure Depression" has received positive reviews. However, these reviews should be taken with a grain of caution as individual experiences may vary. It's always recommended to do thorough research and consult with a healthcare professional before starting any new diet or supplement regimen.