I have probably 15-20 full albums downloaded. They have sales fairly frequently (10% off-15% off) which is nice but even then, it hurts when you press "buy it now". As for sound quality, on the main system I have noticed improvement over standard CD rips. My Levinson DAC is old, but will decode 24/96 and they come through clear as a bell. No messing around with software. I have ripped several thousand CD's to FLAC and done a few A/B comparisons. My ears are not what they used to be and my system is nothing spectacular by today's standards but overall I feel it was worth the cash. That being said, my last 15% off code I used within a few hours of expiration and I never received the discount, even after two or three emails I never did get a response. I got kinda jacked about it - I have spent a few hundred on HDTracks, I would have thought they would have at least contacted me. I'll say this, I wont go out of my way to do business with them.
I see some ripple about DSD downloads and a small yet significant push to go in that direction. There is a lady in California recording in DSD and charging $5 a track. That's too rich for my blood but I read a couple of audiophile reviews of the tracks and the 128xDSD tracks beat even the HD PCM tracks hands down. Sales gimmick? Maybe ... I do see a some DAC manufacturers supporting DSD (Oppo, Benchmark, MyTek). The downloads are bigger but with a broadband connection and a tall glass of beer, it's not much of a concern. I did read that getting software to play native DSD tracks can be a major PITA for both Apple and PC.
Here is the link I was reading ... It started when I was looking for info on the new Modwright DAC, then I was looking at the modded Oppo which now supports DSDx128 (Darbee edition) which now supports direct streaming of DSDx128 files, no need for a PC or Mac. I'd never heard of DSDx128 so I started poking around a bit. Cookie Marenco is the lady's name who is recording in DSD - it's quietly gaining ground. I didnt make it to RMAF this year but I guess there were demos.
http://www.audiostream.com/content/dsd-ready-dacs-short-list
http://www.stereophile.com/content/news-flash-oppo-now-plays-dsd-files
http://www.modwright.com/blog/post.php?s=2014-01-15-oppo-bdp-105-darbe-edition-and-dsd
Anyone care to comment? I'm not an expert when you get deep in the DSD vs PCM technologies but there seems to be an interest in at least trapping music using DSD and some of what I read stated it was as close to analog tape as you could get. I see HDTracks has some DSD material but it looks like it's just SACD converted to HD PCM.
Sorry, I don't mean to go off-topic but I wanted to point out there might be other emerging alternatives to HDTracks and possibly even their technology.