I use Poser 12.  Initially I didn't want to switch from Poser 11 because of all the python scripts I used but since there have been many that came out for P12 and mainly because of Optix rendering I've gone full Poser 12.   Optix has cut down render times to such an incredible degree that I cannot bring myself to go back to Firefly or even CPU Superfly.  I will be moving on to Poser 13.