I have had my air fryer for about two years now. When I got it I tried lots of recipes and found no entree was better in the air fryer than with conventional cooking. What I have found is that it is better for reheating leftovers than using the oven or microwave as it crisps the exterior again and leaves the interior moister. I have kept it around mostly because it does a decent job with potatoes without having to heat up the oven.
My air fryer is on its way to being donated because of 'real estate' issues. It takes up too much countertop space for its usefulness and although it is dishwasher safe, it takes up too much space in the dishwasher so needs to be hand washed, where it takes about four times as long to clean as a frying pan plus take a lot of space on my drying rack.
I'm glad to have had a chance to try it, but short of having a family that insisted on tater tots every night for dinner, it is only modestly successful.