Air fryers are absolutely worth it, but from personal experience, there are two downsides to owning this appliance: size and power. Smaller air fryers, (while great for compact countertops) won't hold the same capacity of food as your oven. And don't underestimate the wattage of your gadget either. I've followed conventional oven cooking times for air fryer recipes before, and my food has come out a little charred. RIP dinner.
Oh, and another thing! If you want to cook things with a wet batter — don't. When it comes to the air fryer vs. deep fryer debate, the former takes an L here. So shallow fry your tempura shrimp or let them swim in a big sea of fryer oil.