I really think the learning curve is steeper with SF than it was with FF. With FF, there were a few tricks to learn, but then it worked with just about every render. Once in awhile, you might have to tweak something, but mostly, once you had settings you liked, you could use them for just about anything.

With SF, I feel like each render has to have its own setup. And with preview not working very well, it's a pain to test. For example, the default lighting with Anime Girl looks great in preview mode and in FF, but awful in SF...but you can't see that until after you render. Which takes forever. (Yes, SF is faster in Poser 12, but it's still slow as heck compared to FF.)

I also don't have a lot of incentive to learn. When FF came out, it looked so much better than the P4 renderer. I was all "OMG, I want to do that." I haven't seen anything that gives me that feeling in SF. Like Digitell, I actually prefer the look of Firefly.

Better NPR would do it, though.