I have not tried it, and if I did I don't think I would notice a difference. I'm already feeding the roots and the leaves. I have read about it before and it kinda makes sense to me. The co2 goes directly into the stomata via liquid instead of gas. I can imagine it could only be a good thing, but crap I've got enough bottles of stuff. Just for foliar feeding I have 6, and I want another one as soon as it's available (Liquid Light).

I hope bumping this will get more responses, though I doubt many people have tried it.