I very slightly nicked the blade once while dismantling and old suitcase (hit some metal hardware just right).......it was easy to hone out though.
I cut tree limbs up to 2" thick with one hack.
The thing scares the **** out of me.
I talked to a Russian ex-soldier a while back and they "found" a real Japanese sword during some sort of seizure......the kind with the folded carbon steel blade.
He said they were able to shatter padlocks with it without damage.