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.
Smeg sells you the retro-chic kitchen dream, but the appliance underneath is a gamble wrapped in gorgeous sheet metal. Heating elements have a documented habit of dying every few years, and replacements cost enough to make you wince twice, once at the bill and once at the realization you're locked into premium-priced maintenance for life. Cleaning is fine, not great, and you're paying a steep markup over Bosch or Miele for looks alone. Buy this if the aesthetic is worth the repair lottery and you've budgeted for parts; otherwise, get something boring that actually lasts.