back in the day, I ground what was basically a BUNCH of them at work. We were dismanteling a locker room, and the lockers were bolted together with 1/4" nuts/bolts, and the lockers were youing to be tossed

piece of O-1 steel, 18" or so long, ground to a chisel, hardeded and drawn WAY down, almost back to full soft. Slip it between the lockers to the bolt, and give it a whack with a hammer, and it would cut the bolt in 1-2 shots. Took about 2-3 minutes to shear off each locker, and then hand it to the guys carrying it to the dumpster

They are a brute force tool, where you don't want to beat on a good knife.

I used mine the other day - I forgot exactly what I was cutting/prying, but I pulled it out of the tool bag, and I know I was wailing on the back edge with a 30 Oz hammer