There used to be a good review/test video out there on that exact supercharger but the whole channel is gone now for some reason. The long and the short of it was that the YTer couldnt add enough fuel to match the forced air induction and he pretty much burnt up his engine using it.
They are a gimmick and the only thing they are good for is running your engine lean. 95% of anyone whos been in the hobby for any length of time will tell you to stay away from them.