The knobs on the cooktop are VERY difficult to use.  Sometimes, it will tell you the burner is on, but it isn't really, because the knob is just a smidge off.  The air fryer is a joke.  The standard bake feature on a cookie sheet crisps things up more.  I'm very disappointed.  I've owned nothing but LG products for over 10 years, but I'm thinking I may look at other brands now.  Unfortunately, I'm stuck with this range until it dies.