I lapped it up to 600 grit sandpaper. The 220 and 320 grits lasted for awhile and did well to flatten the stone, but the 400 and 600 grit seemed to fall apart after a short time on the stone.

I transitioned a razor from a norton 8k to this stone using water. No slurry was created with honing. I even dried the "used" water off the hone and razor with a paper towel and found no visible steel. I will shave test tomorrow but it did pop arm hairs just as efficiently as my 8k can.