Thanks for the quote from the guy, Navin. I still don't buy it. I've ridden the 250 for too long not to know what it sounds like at different engine speeds.
As for the 300, I've read about the powerband "sliding down the rpm range", so I believe that the 300 rides very differently. I would expect to be about 2k rpm down on the 300 if I rode my usual commute, compared to the 250. That bodes well for engine life.