I've had great results printing on Hahnemuhle Fine Art Pearl on my 9800 using Matte black ink. I had almost given up on that paper using Photo black because it would only hit something like an L value of 13 or so for its blackest black. With Matte black, the black point L value is 8.4 reading with the Spectrolino, which is enough to give the print some real punch. There is some gloss differential in the blackest blacks, but Print Shield fixes that, and for some reason, printing with just the three black inks gives a slightly warm toned image rather than dead on neutral, but overall, it's a great combination.