I have several, they are pretty much the same, as far as performance, though some say, some were finer than most.

Lots of old threads on which ones those were. Personally, I feel they are 6-8k finishers, and most are very aggressive. Which led to the massive edge and spine wear we often see.

It also harks to a simpler time of shaving, a barber hone, pasted strop to finish and linen and leather to shave.

They also make great Axe, Chisel, Draw Knife and Spokeshave hones that fit in a pocket or backpack.

Sun, hot water or hairdryer is more that enough to heat, Neetsfoot in a Zip-lock plastic bag, leave it in the sun, also works.