Bob, well, if the owner/user is happy there is always a good reason but personally I am often surprised when the looks of a musical instrument may seem to get higher priority than musical qualities and technical functioning. The keyboard and action of concertinas really have always been weak points of the general construction and several improvements are possible. I have also been much surprised when I have found that quite advanced players haven't noticed considerable wear and uneveness in the action that might drive a pianist or even accordion player crazy in a comparable case.The irregular mechanism as a matter of fact is a technical nightmare.Almost all levers having different length and form, many have varing leverage, setting touch resistance, button travel etc is quite tricky.Jamming of parts is common etc