Playing it hard and a lot... I would not only perform with the 64X, I'd practice about 2 hours a day with it. The reeds move with every blow or draw - do it enough and boom, they go south....
I like the 64x for it's looks and the tone is good, but the one's I had leaked more than the Miesterklasse - which, once you get it customized, runs pretty good.
If you want a pretty and unusual harmonica, have Bill Romel put wood on the comb and make up wooden cover plates for the axe...
Romie