I have 2 houses and have installed Bosch dishwashers in each as the need came up.  The 1st was a 500 series.  I chose the 300 series this time simply because I wanted the front-facing controls which are no longer in the 500 line.  Both are quiet.  I find both much easier to load than other brands.   I also find the 3rd rack as well as the adjustable 2nd rack height very handy.  One negative:  With this unit (the 300 series) the load is never dry no matter what cycle or option (extra dry, sanitize) I choose.  I do open the door slightly when done, which helps but doesn't completely solve the problem.  Nevertheless, its a minor negative and I would choose this dishwasher again.