The time that was put in on this product for testing cook times, and temperature is very evident. Everything I’ve cooked (grilled, air fried) was done exactly perfect. It is so easy to use and the results are perfect. 
I really don’t know how I got along without it for all these years. I read many reviews on different brands, styles and cooking types of other machines and there was almost always a negative with each one except the Ninja, and now I know why. This device is perfect! 
I highly recommend the Ninja. It also cuts cooking time to 1/4 of regular cooking.