After a week of using the oven  I have found it to be extremely energy efficient and well insulated. The only place I feel heat coming from the oven is out the bottom vent. The convection feature cooks food faster and more evenly. I am still learning how to adjust baking times, but so far everything I have cooked in the oven has come out beautifully. The only negative that I have so far is that the phone app requires you to type in your login every time you start the app. I would like to be able to start the app using my fingerprint. I gave it five stars because the food comes out amazing.