Regarding Hans’ review... The only time my Harmony sounded remotely close is during testing when I plugged it into the high current outlets of my Furman IT-Reference 20i. Going back to the balanced outlets marked a huge improvement for me within my system (so much so I just ordered an Audioquest Niagara 7000). I’ve mentioned this previously, but my experience is the Harmony is extremely sensitive to system issues and will happily expose them, so my best guess is there’s something in Hans’ chain that needs tweaking.
There have been some reports on Head-Fi in regards to testing NOS/OS and the consensus is there’s some high frequency roll-off with NOS so the "sibilance" claims are very puzzling and I’d again point to one of the many upstream device Hans has piping music into the Harmony. Some users have reported excellent results with NOS and HQPlayer, which I’m tempted to try, but personally, Harmony in OS has been very impressive.