Got one this year after I figured out I didn't have a suitable adapter to jury rig a starter from an old ferrite motor and that they were pretty cheap to buy. With a piece of 1/2" rubber fuel hose shoved in the small end of the silicone cup, it will start .15's with a bare nut and washer on the shaft. It Really does it on a 4S pack. 3S better for smaller engines.