What is your KILLER product from ClickBank?

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I'm getting started with ClickBank and I'm struggling with the variety of products. There's so many to begin with, so I would like to hear from you what products you have been selling. If you're familiar with some products, but haven't sold them, that's good information also. I think that the best way to choose the right product is to go with the products I have bought already or would be interested in buying. But hey, what to do you think?