If Train of thought is a Metal masterpiece, then this is the crowning jewel of the DT collection. Less Metal songs, and more Alternative rock, every song on this double CD is DTs best work. The Glass Prison is simply awesome, though a little long, Blind Faith, Misunderstood, The Great Debate, and Disappear are all better than anything DT has done before. The Solos put Under a Glass moon to shame.
Disk two is equally brilliant. About to Crash and Solitary shell are bona fide #1 hits. War inside my Head and The test that stumped them all are what Voices should have been. Honestly, Voices is outdated, and need not be a part of DTs catalouge anymore.
Six Degrees of Inner Turbulence is a testament to a band that is growing over the years. Buy this over anything else available. Buy this first, as it will live in your record collection until the day you die. Then, when you die, bury it in a mountain cavern so that in 5,000 years, next gen humans discover it and add it to their collection.