I recently bought a Ninja 6qt air fryer. I like it well enough, but there are some annoying things:
1. It is a little small IMHO. To give you an idea of space, you can fit the equivalent of a medium order of Five Guys' fries. Four hot dogs. Three hashbrowns from Trader Joe's. This is just like, my opinion or whatever, but I think the circular shape of the fryer is not a great use of space, especially if I were reheating pizza or something bulky.
2. I agree with a PP that it would be nice to have a dual zone one if you make meals like tots and nuggets. I can either cook fries OR the meat, not both together.
3. Probably a me problem, but the interior tray is hard to pull in and out. Except when it falls out when I am dumping fries into the family fry bucket. Then it's a hot flying danger disk
4. My in-laws have a different air fryer that beeps periodically to remind you to shake the fries or whatever you're cooking. The Ninja air fryer does not have this function, you have to watch the clock and manually pause the machine and shake. Sort of annoying.
All in all it's fine because I literally only use it to make french fries. So as a french fry maker, it's great, and I like that it doesn't take up more space in my kitchen or splatter grease like a real deep fryer. Easy enough to wash, too.