I use the M3 and am very happy with it. I chose it over the 500 on the basis of the fact that has fewer output devices and therefore a simpler circuit while having enough power for any conceivable use I might have. I also liked the gold front which the 500 does not have. I checked the forums before I bought and the opinion was split as to which was the better. Check Audioreviews and Audio Asylum and others for a wide assortment of views. I have seen few which didn't like both amps.
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