I used to have a Becker Necker, one of these minimalist knives. It was cute and all, but in all honestly it wasn't one of my favorites. I could make it work, but it wasn't comfortable or fun to work, if that makes any sense.
I'm pretty sure I gave it to my son. But he says he doesn't have it, so one of us has lost it. While that made me sad about losing the money (not much money in truth), it didn't bother me all that much about losing the knife. Maybe we'll find it some day and I can give it to someone else.
Now, this Ritter knife may be better than that Becker I had, but I think these minimalist knives have limited comfort. They serve a purpose, and if you need that purpose, great. But if you're looking for a general purpose knife, these are not it IMHO.
You asked about the K.I.S.S. - note that the original CRTK K.I.S.S. have a chisel grind. I don't know if the Stiff K.I.S.S has that as well. So make sure a chisel grind is what you really want. Come to think of it, I believe I have lost my K.I.S.S. too. Maybe losing them is my subconscious way of dealing with knives that I thought I'd like, but didn't. The original K.I.S.S. had a bad habit of partially opening in your pocket, and stabbing the snot out of you when you reached your hand in there. Of course, the Stiff K.I.S.S. wouldn't do that.