I don't know much about RYP, but I do know that my DPX Hest/F 2.0 is a very solid knife, I have been carrying it, and I have had no problems at all with it. It locks up solid, came very sharp, and their customer service is excellent. I sent in my 1.0 and they sent me a 2.0 that had some flaws, and they had me send that one for a replacement, and got a free T-shirt too. They responded to my emails very fast, and sent out the replacements very fast also. I like my Hest/F 2.0, I've never owned an M1 but I hear they are also very solid knives.