Here's the Dynamic Range comparisons between the CD version and the HDTracks version.
www.dr.loudness-war.info/details.php?id=17997 - HD Trackswww.dr.loudness-war.info/details.php?id=10794 - CD Rip
You can clearly see AND hear the difference. I can't wait for more HD Dream Theater albums. I wish they would release more than the Roadrunner albums though, I would buy Scenes From A Memory in a heartbeat!