I was in San Francisco last week and bought some Feijoas at Bi-Rite market (this is the market that sells Yangmei when in season). They were so good, I ate a basket myself in one sitting. They were the best I've tasted, not sure what varieties they were.
I'm growing lots of rare stuff that are high maintenance, feijoas are the opposite. They grow with little care, drought tolerant, can be pruned hard into a hedge or allowed to grow, ornamental blue green leaves, pretty flowers that are tasty and edible and fruit tastes great from selected varieties. I haven't tasted any of the New Zealand cultivars but I'm looking forward to them.
Janet