I would give it a 5 except that I haven’t tried the air fryer yet. It is sturdy, the directions are clear, easy to use.  This is my 2nd D’Longhi.  I used the old one for over 10 years without a problem. I am 80 years old and live alone.    It fact, I used it more than my conventional oven. I would have liked a few recipes for use of the air fryer.  I would strongly recommend this oven based only on the quality of my previous oven. Many thanks for creating such a quality product.