When such places as high end emporiums were available, I went to these places like someone who was on a mission, my mission was to verify, or nullify Stereophile's rating system. For me, I verified Stereophile's rating system.
I'm going to give you examples of Stereophile ratings that are old and recognizable analog audio: Class "A" turntable VPI TNT MK V $6000., and that was one of the cheaper TT's.
Tonearms Class "A": Tri-Planar Mk VI $3250.; Rega RB 900, $995.
Cartridges: Class "A" Lyra Helikon $1995.; van den Hul Colibri $6000.
These different classes are not just some arbitrary designations given by reviewers, but different levels of sonic quality. It's the sound of Class "A" as compared to the sound of Class "B". Of course we all know a cartridge does not generate a sound alone, it's the improvement of the sound of the music after installation of that cartridge in your system. As audiophiles, we are required to learn system compatibility, but that will not replace component quality, and you can not get class "A" sound with Class "B" components, although you can consider whatever sound you're listening to Class "A".
A class "C" Rega TT can be upgraded to yield Class "B" sound with modifications, and there are other components that can be modified to yield a higher sonic quality, but to get into the vaunted realm of Class "A" sonics will require a trip to the bottom of one's pockets, especially since every single solitary component in the chain must be at that same sonic level.
I believe these HD Downloads are generating the equivalent of Class "A" analog. If one already has a Class "A" analog rig, there is certainly no reason to get excited about HD Downloads, but on the other hand, I believe they're economical for those of us who don't.
Enjoy the music.