I bought an air fryer oven just over a month ago and it cooks far quicker than my conventional electric oven and grill. Only a few dishes require it to be preheated whereas the main oven now takes an age to come up to temperature which means there has to be a resultant saving on time and electricity. I’m very pleased with the results so far. I am now a one person household so I’m finding it very useful. My main oven will still come into its own for family Sunday lunches and batch cooking cakes of course, but that doesn’t happen every day.