Not so good. It shaves, but against the grain there are several areas I did not finish because clearly I was going scrape off a lot of skin. Even in the easy areas, I still have some roughness.
Does it ever get so sharp that the razor will glide off the hair on the across the grain pass? I've gotten some very nice shaves off other stones, but none yet without some degree of 'scrapey scrapey' feeling on chin/moustache.