Mike,
From my experience from the reviews I find them pretty good but none of them are able to pull the turntable out of the equation to my satisfaction. I happen to prefer the Raven w. the Mystic Mat or no mat. Contrary to a few others. BUt...., the Boston Mat made the Raven sound more like my Hyperspace. What is funny the Boston Matt is slightly similar to the Hyperspace. Go figure. I found the Boston Mat to make everything sound slightly diffuse and bloated. Also, it softened everything. I had the option to return it & I did. Mind you I hate shipping things back so that says a bunch. In the end there might be more analytical tables out there. Given my bias, which is detailed but relaxed, the Raven meets my needs. I don't want anything edgy or fatiguing. But I don't want to lose detail. The cartridge arm synergy in the end will be the determining factor for the Raven. On a different table it might be a balancing factor. There are lots of great tables out there.