We spent extra to get an oven with dials, thinking the mechanism would be simpler/less prone to breakage.  When the oven arrived, however, we realized that the knobs control the digital screen!  It's weird.  The timer (touch screen) is difficult to use, and the oven itself is LOUD.  The convection fan rattles when it's speeding up/slowing down.  We kept it because it's a pain to uninstall/reinstall wall ovens, but I can't say that I'd recommend this oven.