I have both the aluminum and the granite for mine -- but the upgrade was done by a previous owner, so I have not bothered to compared them. I will say, however, that I replaced all of the sorbothane pucks (a total of 16, four on each side) that go between the aluminum and the speaker components with "fat black dots" from Herbies Audio. A worthy improvement, for my money. Not a huge difference, but certainly appreciably improved clarity, precision and energy. Just wanted to throw that out there as an option -- whether you end up with the aluminum or not. (The sorbothane pucks that come with the aluminum are significantly more substantial than the little ones that are packaged with the granite -- but they can be replaced just the same). And, it turns out, the granite seperators are exactly the right size to fit under my amps. So, I chalked it up to fate, and that's where they now live.
