I got an air fryer this year, and I definitively recommend it. It was cheap, I paid 350 reals (roughly 70 euros). In some cases the food is really similar to deep-fried food, but the biggest appeal of the device is as a small but powerful oven - specially for stuff like

• chicken wings - they turn out wet but well cooked, with a crispy outside
• reheating stale bread - pat it with a bit of water, then plop it in the air fryer.
• frozen potato fries - as he mentions in the video they get damn great
• milanesa - it doesn't get identical to deep-fried milanesa but it's really good, and way better than doing it in the oven.

If looking for a model make sure to get one with a detachable false bottom, otherwise you'll get the problem andrewta mentioned and won't be able to clean it right.