I have both the Protank 2 and 3. I didn't see much of a difference with the dual coil. In fact so much so that I rebuild the dual coil head as a single now. I think my single nano coil system works better than the stock dual coil. I haven't tried to build a dual coil on it yet just because I think there's too little room to work with and could be subject to shorts being that they rest upon each other pretty much. It'll also be more time consuming.