Still using Poser 11, mostly for VWD.  I don't render inside Poser, and 12 didn't seem to offer much above 11 if you don't care about Cycles/Superfly.  Waiting to see what 13 looks like, might be upgrading but the loss of unimesh support is a ding in the negative column because again...no unimesh support is what I already have in 11.