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I just bought a 2nd hand VSD IV from someone so would like to show you all what you are paying for actually.... I think the retail price is ~$180. Bought it for $100. Considered a pretty decent deal. Open up the unit and I was like...... wtf........ The circuit board is much smaller than the casing and its held by silicone glue and 4 stands. Its not even secured by screws on anything.... the bare circuit board shows a very similar layout of a DC-DC converter. The controller is sanded so I don't know the markings. The 2 black chips are just a MOSFET and a diode. Large silver container is a capacitor. 4 wires instead of 3 for most standard Voltage boosters. Nothing much. Just that it uses power from the battery (or a +ve) point instead of the from the power going to the coil. Pretty redundant. Only saving grace is that the soldering looks much better than the imperial concept voltage booster and there is a module which you can see the voltage and adjust. So whats so good about it? Well, it works as it should. Boosting up to 18V to the coil. Higher primary voltage = higher secondary voltage. Means more power and stronger spark. Bad thing? Its damm expensive for something thats so cheap to make and its not even rocket science. Nothing to research about as DC-DC converters have been around for decades.