Hmmm....very interesting and enjoyable thread to read - all 51 pages. I've been giving Amazon HD a spin for the past month and a half and I can now say that 'm more than satisfied with it. I had a few hiccups early on, but now it's performance is nearly 100% as advertised. I say nearly, because the only minor issue I have is my DAC/headphone amp (Gustard A20H) always shows the PCM stream at 192KHz. The HD label used to be a little buggy when I clicked on it to show: 1) Track Quality 2) Device Capability and 3)Currently playing at. Now it is spot on every time. "Track Quality" and "Currently playing at" are now always the same, despite my DAC showing 192KHz. I have tracks playing from 16 bit, 44.1khz all the way up to 24 bit, 192khz. I can detect no extra brightness, other than a little more detail and air on some of the higher resolution tracks. Perhaps there was an update to the Amazon Music HD application that I'm running on my Ipad. Sound quality is outstanding and I find the catalog is deeper than Tidal for the more obscure stuff. The price differential for the "family plan" makes it an easy decision for me....goodbye Tidal. I'm running a 2018 Ipad mini into an Uptone Audio Regen via the Apple CCK adaptor, then into a Tanly USB-DDC and finally to the Gustard A20H via I2S connection. With this setup, Amazon is very satisfying.