Short version: Wow. The most delicious oyster I've had in at least a year. The flavor starts sweet and clean, and as you chew--and I wanted to, to get all the flavor--a hint of briny sea comes out, followed by a mineral-rich finish.
For some reason, I've never noticed the Oyster farmer at the Alemeny farmer's market before, but today I did. I wanted to try one or two before I committed to a dozen, but he doesn't have a license to shuck on site. I ordered a pound of mussels anyway, and then he offered to let me borrow his shucking knife to try an oyster, and boy was I glad. Delicious. I took home a dozen, and the 6 I just ate were each really wonderful.
Poking around on the web, I find that Point Reyes Oyster Co has been around since the 1980's, run by Martin Strain. He sells at Marin, Alemeny, Vallejo, and Alum Rock farmers markets.
Products include kumamotos, sweetwaters, limited production of mussels that they glean from the oyster nets, and clams.