I purchased this because my older basket type air fryer was losing it's "non stick" surface and things were sticking and making a mess.  I saw this and decided to try this type instead.  I didn't want to spend a lot of money until I knew how it would work.  
Well, it works great.  It's a bit small, but because it's got the flat surface, things brown more evenly and cook a lot quicker.  I've cooked many different things in it, and am very happy with this purchase.
I use it almost every day for one thing or another.  It's also great for reheating leftovers since it heats food quickly and evenly.