Bohlender Grabener Z-1's vs. Usher S-520?

Has anyone spent any time with either of these two speakers? Bohlender Graebener Z-1's or Usher S-520? Just wondering what owners impressions might be of these two. Thanks.

both are quite different....this is more a preference thing, than a quality for the money thing.
I have the Z-1's and can't stand them. They are very bright no matter what of where.