About six months ago I bought a Godzilla green FFG FRN Endura in ZDP-189. Didn't have any experience with the steel at the time of purchase, however, after ~six months of heavy use, I have to say I really dig this steel. I don't have any real science to throw at you regarding ZDP's ability to outperform x,y,z but from my purely anecdotal pseudoscience, this steel has outperformed (edge retention and resistance to edge chipping/folding and blade scratching) my Spydies with M390 and M4. Anyone else with the same experience?