In the US I tip, if I am happy, 20% at dim sum places. They rarely get good tips and they often get less than minimum wage, so I do more than most people I know. Of course at Tropical Chinese in Miami I feel as though I've landed in Hong Kong; except for the Spanish-speaking clientele, that is. In the SF and NYC places I usually tip less because the service and quality are usually poorer. Why Tropical Chinese is so good I haven't a clue, but this thread is about tipping in Dim Sum places, not the places themselves