I got this cool little hone in today, two sided. The coarse/dark side feels about 4-6K and the light side feels about 8-12K.
I test sharpened a project razor, and I'm happy to say it works pretty darn well!
The coarse side (with lather) cuts a little faster than a Norton 8k, and the fine side polishes better than the 8K.
If I was more experienced, I would post a review of it, but I'm not experienced enough for that yet.