I did not buy my 1000mah ego twist from this vendor, but I wish I had. The price on this is one of the best out there. Most sites charge around $35 (at the time this review was written). If your using ego batterys and like them, you have to do yourself a favor and get atleast one. Only draw back is if your using dual coils. If your go past 3.7v the voltage scales back down. But for anything single coil your gold. Still fires DC great like any 1000mah ego, just no extra volts.