You sure? I just tried it on live on lots of different scenarios (albeit now raiding is kind of a joke) and PS isn't going to be good unless the adds live for it's full duration, what's unlikely for now and even more unlikely when we start overgearing fights.
I think it's like cataclysm, a niche talent that can shine, but now has it's damage spread over ~13 sec instead of a burst.
I can't see the artifact changing this line of thought.