Support BladeForums! Paid memberships don't see ads! I kinda missed the train on Rex 45 when Spyderco dropped their sprints last year. The scale color wasn’t my thing and I had an aversion to non-stainless steels. Over the past couple of months, I’ve been using and sharpening M4 quite a bit while kicking myself for my fear of oxidation. Some of my best edges ever have come up on M4. So, talk to me a bit about your Rex 45 experiences.