The Ninja CRISPi 4-in-1 Air Fryer receives overwhelmingly positive feedback for its compact, space-saving design and fast, even cooking performance. Users praise the dual glass containers for easy monitoring and cleaning, as well as the versatility for air frying, roasting, and reheating. Many highlight its quiet operation, intuitive controls, and ability to produce crispy results without oil. A few note that the lack of manual temperature adjustment and some cleaning challenges are minor drawbacks. Overall, it is highly recommended for its convenience and efficiency in everyday cooking.