I'd wait until more mature BIOS's come out before making a full conclusion.
But according to AMD, seeing even 1.45v is okay. So good voltages seem to just be opinions as of now. (I mean stock, I'm sure AMD doesn't want us overclocking on 1.45v or anywhere near that.)
1.337v is really good, i have a C6H and a 3600, i hit a all core voltage of 1.373v.