Hi Bill,
I never tried the Harmony M, so I have no comparison; however they advertise it as having 5X the processing power of regular floor units.
So far it is tracking chords great for me and I have had no trouble. Just a whole lot of fun.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer