The 4-channel version of "Bitches Brew" is astounding. Multichannel sound is the perfect medium for a studio recording that is so dense with musical ideas.
I'd lived with (and loved) the stereo Columbia release all my life but the surround version (avaialable only as import only at this point, I believe) gave me one of those goosebumpy, uber-thrilling musical experiences that keep us in this hobby.