First off, what's INFI (remember, I'm the new guy!). And second, I have always had a soft spot for tool steels too. I've made some fixed blades, both grinding and forging (I'm absolutely no risk whatsoever to those who do it for a living, but it sure is fun) out of O1 that I've had great results with. I finished one once, and my son, then age 8, was playing outside. He'd been handling knives safely for a year or so, so I enlisted his help. My instructions to him? "Break it!" We chopped, we sliced, we threw, we beat it around in a way that I cringe to think of now. Awesome stuff. Even had an edge left (sort of) when we were done. It ain't no Emerson, but even with a home-grown heat treat, it's my hunting knife to this day. Tool steels do indeed rock!