Ok, I decided to give the diamond plate its first real workout.
Here we have a frontier style Tomahawk replica, done in hardened steel, on a hickory handle, from way back from from my SCA (Society for Creative Anachronism) days. Blade's a bit too thick for throwing, and it's already got a nasty notch at one end (courtesy of hitting a log with a hardened nail in it). Ever since the day I'd notched it, its been languishing in my closet (20+ years), waiting for a product like the DMT to come along, to breathe some life into it.
What a pleasure to finally have a stone that can stand up to some full body honing action.
Anyway, a mere 15 mins later, the 'hawk emerged from a pool of sharf with the rough beginnings of a new edge ... the notch is already half gone, and I've begun lowering the angle on the edge by several degrees. Clearly there's a lot still left to do, but it's already off to a good start. The diamond plate was, as expected, untouched. A wee bit smoother perhaps (or rather, properly broken in), but still in perfect condition, despite sustained vigorous contact with heavy hardened steel. Back in the day, my old undersized (and rather clogged) Norton oil stone quailed in fear at the sight of tasks like this, as did the anemic 3/4" electric grind wheel in my father's basement. Even today, I'm sure there are a lot of natural waterstones out there that would have dished/gouged badly under such abuse, but the DMT held up fine.
Be advised: The universal holder does tend to slip on a very wet counter under medium (or greater) force, so a brace of some sort is needed for any task involving serious elbow grease. Plan your setup accordingly.