Bosch's 500 Series nails the two things that matter most: it's whisper-quiet and cleans without fuss. Owners running two loads a day report eight-plus years of reliable service, which is rare in an era when Whirlpool and KitchenAid pumps fail at year three. Plastics stay damp unless you crack the door or use the auto-air feature, and the racks feel cheaper than the price suggests; a few pumps have died just past warranty, requiring $300-400 fixes, though it's not epidemic. If you value silence and solid cleaning over bone-dry dishes, this is the sweet spot; if you need everything dry or want racks that feel premium, spend more for the 800 or look at Miele.
Whirlpool dishwashers clean competently and load flexibly, but the circulation pump fails with clockwork reliability at 2-4 years, turning a mid-range appliance into a $200-600 repair bill the moment the warranty expires. Upper rack wheels snap off, soap dispensers stick shut, and control boards die often enough that techs recognize the pattern. Parts are easy to source if you're handy with a wrench, but at this price point Bosch delivers a decade of service without major surgery. Skip unless you're comfortable swapping pumps yourself or have a cheap extended warranty that covers the inevitable.