If you check my site on those archived models then you'd see it was a joint offering with Creative Sound Solutions. They were in fact dealers for Aurum Cantus and wanted to use the ribbon tweeter in those designs. It was a nice ribbon and worked out well in those models. You can view them here:

http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=127

http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=128

Still, a BG Neo 3 pdr, and custom variants that they do for me, easily out perform them in a number of ways.

Oh yea, I was also a distributor for the Raven ribbon tweeter as well. I have been there and done that with all of those drivers.