Here's another "diamond plate" to try if you're curious, the Tsuboman Atoma "foil". The only vendor I know of is Stuart Tierney at Tools From Japan, but this foil is made differently from the regular Atoma plates. The dots are much more dense and the foil is not as aggressive right out of the box.

I wish I could give more information about its performance except that it's very good (fewer scratches) as a nagura compared to the plate, but I've just started testing it. I hope a link is not inappropriate.

Tsuboman Atoma 'paper'. : Tools from Japan, Japanese woodworking tools direct from Japan.

Cheers, Steve