No fancy features, the design could clearly be improved, but chuck anything in this small chamber, crank up the timer and delicious food comes out 10mins later. I've gifted nice models to others, without feeling any need to upgrade my own. Maybe when it breaks.
I would suggest sticking with a small one though. Quicker to heat, better circulation etc
You did mention it yourself - "It gets a little dirty inside".
Compare it to the $30 air fryers that are essentially an insulated cooking pot with a detachable heating element. They do the same thing but are so trivial to clean since they are a cooking pot that fits in the sink.
It's one of those things in life where cheaper is better in my opinion and i do not recommend the above product at all.
https://www.ninjakitchen.com/exclusive-offer/DZ550WBKT/Ninja...