I just purchased some Capella's flavor drops. I'm a chocoholic so I bought Double Chocolate, Chocolate Fudge Brownie, Peanut Butter, and Toasted Almond to test them out. I love them all and much prefer Capella's over Lorann Oils.
The Double Chocolate is a deep dark chocolate flavor and it would be very easy to use too much. Very rich tasting. The other flavors are just as tasty, with the Toasted Almond being a little weaker I think. I'm very happy with these drops. I will be trying their other flavors soon.
I've heard good things about Bickfords too but I haven't tried them yet.