Mrs. Majuki and I ate at Tender Greens in San Francisco on Friday. Like the Stanford Shopping Center location, they had the Vivopay contactless readers. The cashier seemed a bit surprised because he said, "It doesn't always work."
Also, I was at Meet Fresh today in Cupertino, and they have a new self service ordering station. Unfortunately their credit card terminal at the station is swipe only, and mobile payments don't work even though the terminal says, "Tap or swipe card". The main registers accept mobile payments, however.