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My question as an amateur is how much better can the tone, volume and control get after a redo. I have been happy with out of the box, eg Marine Bands.
Is the question beginner or amateur? If it is for a beginner, I would recommend against a customized harp. A customized harmonica is much more responsive, therefore much more susceptible to reed damage. A common problem for beginners is playing with too force. Better to ruin a $25 harp.