It’s a beast of a machine.  Pre-programmed cycles (including the cleaning cycle) are very useful and work well.  It is quiet at low RPMs and much louder (naturally) at higher speeds, in order to do the heavy work.  Seems well designed and well constructed.  Controls are logical/intuitive.  A big investment, but anticipate a long life span.  The gray model has a “metallic” style finish like most new cars and is very nice.