I came off the WM1Z myself, and the reasons....the primary reason for that is because Dx200 has superior imagines and soundstage to WM1Z. Not only that, the Dx200 also support WiFi for streaming and internet needs.
@rutter , go get a WM1Z, and return the Dx220. You are in the 15 days satisfactions period....no question asked. But I recalled a few posts ago you were complaining about streaming capability of Dx220.
Yeah, sound is subjective, and there are places that WM1Z still is ahead of the Dx200, and that is the Timbres, and it Analog/organic tones....or that zombie like Battery..... Soundstage is never any doubt IMO that Dx200 is doing better. I have also seen others who have traded off their Dx200 and got into WM1Z. There is nothing wrong with that as sound is subjective, and you are welcome to do so. I would strongly advise you to do so. You know ? Switching into WM1Z.
But then again, I will say it, the WM1Z is good, and worth the money, but to me the imagines and soundstage on the Dx200 and Dx220 is superior, and that is from Amp3 module, let alone Amp8.