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The H will fly fine as the props come out of the box. However, to give you smoother performance all around and greater longevity on the mechanics all props should be balanced! that is not specific to the H, it applies to all model aircraft...
Props should absolutely be balanced for best performance. Even the smallest amount of vibration that can be reduced by balancing is just that much less hammering being induced into the board and electronics in the H. I use the sanding method simply because that's the way I've always done it over 20 years of RC heli and jet flying. But, use whatever works for you. Just do it.