I'm a 50 year old woman and I have a bad back and a bad knee. I haven't slightest idea what my bass weighs and I don't have a scale large enough to weigh it. It's no feather, I can tell you, but I have no trouble wearing it for hours.
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Heavier basses sound better. They have better sustain because they have more mass, not because they are stiffer. I honestly don't see myself buying a StingRay Special, because I don't want an instrument whose components were specifically selected for lower mass.