We are just getting acquainted with our new Bosch combination oven. We thought we wanted double wall ovens but have liked the features of the combination oven. Thus far cooking and baking in the main oven and using the microwave function of the speed oven have gone perfectly. We have yet to try the convection and roasting/broiling in the speed oven. Hopefully it won't be hard to keep clean. We are new owners. Hopefully the oven will hold up over time and not require expensive control board repairs.