Am happy with rest of my Bosch kitchen, but the Speed Oven leaves a lot to be desired. The design puts forth only a feeble ring even if set up to highest setting. The preheat bars are barely visible even if set up to highest setting. As a former technical writer, the manual makes assumptions on the part of the user and therefore is missing steps. Writers should be advised to test every one of their instructions and not assume the user knows anything. I am very disappointed with this unit and hope that it might be replaced with a redesign.