Dimensions is my favorite, but Sanity Obscure kicks ass too. The riffage is so fast, tight, and intricate throughout. I've heard some call them Destruction clones, but they were never as technical, aggressive, or ambitious as Believer was on that album. The "experiments" (Dies Irae and U2 cover) don't really work, though I think Dimensions and Gabriel balances the thrash and non-thrash a lot better. Great band all around.