It's really hard to say; as I said I have never used synthetics all that much. They're a bit porous, quite fast on slurry and I figure a bit on the soft side (at least mine wears relatively unevenly quite fast). I have done bevel repair work on it, but I have also had a decent, comfortably shaving off it. I'd say if you max out the edge it's a bit keener than a coticule after regular bevel work on milky slurry, which makes it a great pairing with coticules.
Bart Torfs did an
extensive write-up on it back in the day.
Best regards,
Pieter