I have been using Cigotine for 2 weeks now, I like it, considering where I purchased it the price was fair in my opinion either way its cheaper than cigarettes. The vapor was much more refreshing than a cigarette. I'm not sure that i want to add my own drops, I like the convenience of just picking up the box of cartridges, and screwing them on and going. I can smoke everywhere and that's good enough for me. I will consider trying other brands if I dont think this brand will work out, but as it stands it works well, the staff they have are friendly and knowledgeable, I rather a person to person then order online, and not be sure of what I am going to get.