My personal success criteria for SvnBridge is when I no longer care what I am working against. And I think we got to that point. There are still issues, to be fair, but they won't hit you anywhere near mainline development.
I am listening to Rob Conery MVC Storefront 9 in which he makes the mistake of referring to CodePlex as Subversion. With that, I think that I can say, we are there.