Its not a sudden inmediate cut-off, its a bit gradual so its not that apparent, but you notice that the exhaust goes quieter under acceleration when you are wanting to hear the enginge growl, or sometimes you pick up the throttle somewhat hard and there is no growl until the speed climbs further.

I wouldn't mind havin't it on all the time, but in the city it calls some attention which I don't like, so if the switch is there I may disable it sometimes, but if there is no switch its not that big deal, but its handy to have.
Inside the cabin the sound is not bothersome at all like other exhausts that sort of resonnate or are just plain loud with no nice sound, they get tiresome, but the PSE always sounds nice and when it has to sound, not so much at constat throttle driving.