I ordered a blu before knowing anything about e-cigs. Googled e-cigs and blu was the first with a lot of positive reviews, and I found out their disposables are sold at walgreens. I liked the flavor and such of the disp., so I ordered the starter kit. after a few days of charging one battery, while using the other and the one in use running out a few minutes before the other was done charging, I did more research. I found a few places that said that the volcano was basically the same thing. I really liked that idea since I already had tons of cartomizers for the blu, and all of the volcano batteries have the same threads. I ended up ordering a Volcano Magma. Battery lasts quite a bit longer, and all carto's are compatible.