Air fryers

I see that someone asked a question on their power last year but the discussion didn’t go far. This question is for those that use one. With fuel prices going up OH is looking at fuel saving and having the cooker on less. Whilst away we met a chap who uses his air fryer for almost all his cooking and firmly recommended them. However, it seems everyone has the same idea and the larger ones can’t be bought anywhere. Lakeland can’t get them in stock until at least November, with many others the same. Now people are selling them on various websites, eBay, for twice their original price, this always seems to happen when supply of an item is short. My question is, are they really as good as they sound? And if you have one what make would you recommend. Despite all his enthusiasm OH never cooks so guess who will be left to use it, that is if we can ever get one.