I think there's the feeling of heavy = solid. Probably wrong most of the time, but the first thing I do is to kida bounce the machine in my hand even before thumbing it. If it s too light there s this not solid-almost like a toy feeling, which is untrue but I guess it s involontary. ie : I would tend to think that my RW or HM would last longer than my stigma hyper or benefits of a better craftmanship, but then again I know it's stupid and totally unrelated.