Thanks for an excellent review! I had a chance to speak to James today and found that he's used the Meara on an M390 based knife with great results! Can't wait to hear more! I'm finding similar results with this stone on knives like a Spyderco Military using CTS-XHP (Carpenter tool steel), another one of the popular 'uber steels'
It really is an interesting thing to try to explain. You would think naturals might not play well with these types of steel - just classic carbon steel knives - but they do! I have my theories but the proof is in the pudding - they work well on them. Now the theories have to explain the facts. I'm still working on an explanation...
this is also quite a hard stone, I suspect it will also be a great stone for razors.
Fortunately this is not an extremely expensive stone.
The stone name is a bit confusing as the ara part of the name, Meara, refers to 'coarse' as in arato or coarse toishi, however the stone is classified as an awasedo or polishing stone. It is described as a coarse polishing stone, however as James shows and as my experience also shows, this is not that coarse even for a polishing stone.
Now James has used a coarse diamond plate for slurry generation but will be experimenting with a much finer 1200 Atoma slurry stone (2x3" plate mounted on granite backing to make it easy to hold) which has just gotten in his hands
I think he's going to have fun. Stay tuned!!