I've ordered 2 samples. One pearl - matt, and one Carbon. They were printed on a double sided Tecco paper, which I think has a slight, slight pinkish tint. Overall the quality was very good. No color tint on the pearl, except for the highlights, where the paper color showed through. And a very slight warm tone on the carbon. But the pictures they have on the samples doesn't contain enough tonal range to see how my own images would look like.
I will order 3-4 inks in the carbon range, and use in my Epson 1400, since I don't have any need for perfect, six ink results.