It's definitely a good deal. Plus I have some leftover parts to start on another one if I find the need. I think I'll go with something running a smaller battery to carry around in my pocket. The inside diameter of 1/2" copper should be about 13.8mm and the outside diamter of a 10440 or AAA battery is about 10.5mm, so I think my next mod will be something in that size, just to carry around in my pocket. I can always bring a couple of extra batteries, especially considering how cheap they are.