I have a long (multi decade) history with benchmade knives, and because edge retention is their primary concern they over harden their knives. A couple of my Benchmades, in fairly pedestrian steels, and I have found the common knives harder to sharpen than their premium, limited run steels. A prime example is one of my favorite utility knives, the AFCK. I have two in ATS34 and one in M2 High Speed Steel. I will sharpen the M2 any day of the week, and I send my ATS34 back to the factory to be re-sharpened. I have never been a fan of ATS34, despite the industry love for it, and I blame Benchmade; my first and only experience with it. I know others love the Paul Bos heat treat on ATS 34, but I can't get myself to spend the coin after seeing what benchmade did to it. ATS34 and M2, both hardened to 60-62RC behave very differently when you try to sharpen them yourself. If you have a sanding wheel and a buffing wheel, then you should have no problems, but if you are using less sophisbos. ated means to sharpen you will have issues. It does bother me that they are no longer listing hardness on their blades.
Of course, I have not bought a benchmade in the last 14 years or so, so if their philosophy, heat treat, or metallurgy have changed for the better, I wouldn't know.
pat