I downloaded their profile for the Epson 3880, had good results with a test print. Most importantly softproofing in PS and LR gave a good match to my normal print examination lighting. I also examined their profile with Chromix ColorThink, all the right pieces are there, even the target measurement CGATS file is included (1877 patches).
The profile specified a black point of 17,1,2 and white 98,0,2. All in all, a very pleasing matte paper.
Richard Southworth