positive displacement supercharger > that. google it if you don’t believe me 
“The roots-type supercharger is a positive displacement system referred to as a blower since it doesn’t compress air directly, but simply moves it quickly. It employs 2 or 3 counter-rotating lobes to scoop a fixed amount of air from the outside and deliver it into the intake manifold. Unlike the compressors of the turbocharger and the centrifugal supercharger, which deliver exponentially greater boost with increased rpm and which are not designed to perform at lower rpm, a positive displacement supercharger pumps a fixed amount of air for every revolution, and delivers instant boost even at low rpm.”
like I said, all of the bad things about a turbo (lag) w/o the benefits (boost reliant on exhaust gas vs a pulley). shrugs at $300 who’s to argue, but it’s not my style, like I said.