I find it makes an effective paperweight. lol!
I've tried TFA Sour and Lorann Tart and Sour (or whatever it's named) all the way up to ridiculous percentages. A drop of the liquid on my finger tastes just right, but vaped? - nope, not sour or tart to me.
I've long wondered if some of us just can't taste the effect when we
vape it. I've heard the same from several other people. but then, some use a drop in 5ml of their
juice and say it makes a difference. Not to me, not even at 15%.