I’ve had two of the 300s and my experience matches mcman56’s most closely. They can be made softer off the bottom with modifications. Proper jetting, gear down a bit, low compression head and carbon reeds on mine. Purrs like a kitten and grunts like a pig. But... it is still a 300 and will remind you of that fact if you get sloppy with the throttle. Lose focus and you better have a quick clutch finger. I haven’t tried super smooth but I have had Betas with added flywheel weight and I just don’t care for the run-on you get with a flywheel. I also like feeling for traction with a more responsive engine but to each their own.