Those are very effective in removing money from your wallet. But they sure do look cool.
Basically all a supercharger does is to charge more air, and with that more fuel, into the engine than it would normally take in giving more power since it's burning more air/fuel mix.
Now think how your model two stroke engine works. The air/fuel is pulled into the crankcase and then the pressure from the piston coming down forces the mix into the intake ports and at the same time opens up the exhaust port. The incoming mix forces the burnt gases out the exhaust port. That's the timing of a model 2 stroke. A supercharger would end up pushing out the unburned mix with the burned gases and you would have about the same amount of mix in the chamber as you would without the supercharger.