Some of my favorite amps have them. The Komet 60, the /13s ... I love those amps up to the onset of the schwoosh. But I don't care for the schwoosh. There's also a looseness that seems to go along with the schwoosh. I've read that these types of amps are underfiltered to get more complexity, and that's what's causing that. Is this accurate? I think I'd prefer to take it up to that point, just before it, and hit it with a pedal. Interestingly, the Komet Constellation doesn't seem to do this ... I'm guessing there's plenty of people that like the schwoosh, but not me.