We purchase this 500 series microwave two and a half years ago as part of a full kitchen remodel.  The microwave, the last applicance installed lasted 2 years, 2 months.  That's it...After reading many other reviews, you either love this product, or are severly dissappoined with Bosch's committment to design integrity.  Have to seriously rethink about replacing this with another Bosch microwave, as I have serious concerns for this product.