Even though the dishwasher in our home was only five years old, we were not happy with it. We decided to replace it with a Bosch.  When the installer arrived and took out the old dishwasher he said we were going from below average to the best there was. He explained how the Bosch was insulated and it would be very quiet. He was certainly correct. We also learned that there was no heating unit inside yet it dried all the dishes through some condensation process. I still don't know how that works but it works perfectly. Our dishes have never been cleaner with no pre-soaking needed.  It is a quality appliance. We didn't know we could be so excited about a dishwasher!