Usher speakers/prices?

I recently discovered these speakers and know little about them, other then the pair I heard (CP-8571) blew me away. Made it hard to listen to my Veritas 2.3i's which I thought were great.

Of course their very expensive. I've noticed a few pairs showing up used at about half the list price. Anyone have an idea of the normal discount is for these speakers?

For those of you who own or have experience with these, I'd love to hear from you. I'd aslo like to know how their 6 series compares to the CP's as well.

Thanks.