I've been using WTA. I find it imparts an earthy, tobacco-like undertone. It also blends flavors together.
So, let me echo some of what has been said.
1. If you vape a bakery, or a "caramel-ish" deep flavor, or one of the "heavier" flavor types, the WTA might be an excellent compliment for that. I find it makes the butter in my butterscotch pop more.
2. If you vape a clean menthol, or one of the lighter types of fruit, the WTA becomes more noticable and the earthiness clashes a bit with it. Still a good vape, though.
3. If you vape something that is supposed to have clearly defined different flavors, the WTA will blend them together a bit. Still nothing unvapable, though.
I'd rather have slightly messed-up (but still very vapable) flavor with WTA than to go back to cigarettes. The added flavor never creates a problem I can't deal with. Not by a long shot.
Thanks!
-Johntodd
EDIT:
As for the price, don't let that scare you if you need WTA. It only takes a couple of drops in a tank for most users to feel satisfied. So, obviously, it is mixed with your regular juice in small quantities, so it will last a long time.