Quite true that the performance of the supersonic is better than the Bisson
but of course that comes with a price. The price is noise, so in addition to the
performance issue you have to be somewhat concerned about where you fly
and how sensitive the noise issue may be. If you fly where there are no neighbors
and it doesn't bother you, go for the Supersonic. I personally find the Supersonic
sound irritating so I wouldn't use it if I was flying alone in the middle of the Sarah
but that's just me.