I recently bought a small bottle of TFA Caramel Cappuccino, even though I don't drink coffee. I wanted to try it out. Put 2 drops in 10 ml with Sweet Cream and some sweetener. Tried it out, it's fine and it definitely tastes like coffee.
The problem is the room smelled strongly like coffee for a long time, and I couldn't use the RDA I tested it in (Tugboat clone) for anything else until I changed the wick and coil, and washed it thoroughly. When I went back to my ADV in my RTA that never touched it, I swear I could still taste coffee. I drank a soda, still tasted some coffee. It was like eating something with a lot of garlic, it keeps on giving long after you have finished eating.
Not a bad juice, but way more trouble than I am willing to put up with for it. I'm guessing it will steep for a few weeks until I try it again.