hdcd discs compared to sacd, cd?

Has anyone listened to hdcd discs? Are they better than cd/sacd? If so, why hasnt it become popular?
Right up front, I am a fan of HDCD. I have several cds in both standard and HDCD versions and the difference is not subtle; HDCD is superior everytime. The depth of soundstage and better defined localization seem to stand out.
As for SACD, I purchased an inexpensive player and a couple of discs but lost interest in the format as I don't think it's going to survive in a big way. My opinion on SACD's sound quality is not worth stating as I didn't give it an honest listen.
Either way a good universal player that plays all three might be worth a try and judge for yourself.