I think the Black Mages are overstimated. Just because they play Uematsu's songs, and he is in it too, doesn't mean they're as good. There are a few pieces I really like, but there are also a lot of arrangements that are terrible.
Some are a little too obscure or overly grandiose for me.
There's a thin line between being awesome and whaling incessantly on the guitar to the point of annoyance.
But alas, I'm a bit of a purist when it comes to these things, so I tend to strongly prefer original sound versions or orchestrated/piano arrangements with at least some artistic rendition rather than being a carbon copy with real instruments.