The only time I would really benefit from "fast charging" is when I'm traveling. However when I'm traveling I don't want to have to bring multiple chargers (and cables) and if I just bring the one that I'm not saving any time if I have to charge my iPad, then my iPhone, then my watch...
I don't really care if my iPad takes 2 hours to fully charge vs. 4 hours when I'm sleeping 6 hours anyway...
So still waiting on a nice portable/dual charge solution myself.