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I got one recently. It doesn't do anything that an oven can't but it does it quicker and easier.
I've got a ninja one that is also pressure cooker, etc which is useful but does have less cooking space than a dedicated one (although you can still fit a full chicken in).
Main thing to consider is that they are pretty sizeable and I wouldn't say it's worth it if you're going to put it in and out of a cupboard, you'll need worktop space.
Has any one got any recommendations for an air fryer? Or is it hype