I like 66P and and 3P+K myself. I honestly wouldn't touch 6H+K other than to punish a whiff or add into a combo. It's so risky that most people can punish it even with slow reflexes.
I assume it only works on lightweights.
Edit: Wait, it should work on all weight classes. It probably just whiffs if the camera moves certain ways, like some of her other wall combos.