Can anyone tell me about this mysterious hone?

I'm kind of romantic about natural hones. And a fan of Robert Burns, the 18th-century Scottish poet who wrote the poem after which this hone is named, and from whose hometown the stone is quarried.

Does anyone have one? Has anyone ever used one?

"Tam O'Shanter" is about a married guy who stays out late, gets very drunk and has a sort of close encounter with a witch on his way home.