I also play with a blade of Robert Palatinus for 3 years (OSP Martin AC) and I can tell you that the quality surpasses all other industrial brands, I also made a video on my channel on the Martin AC if you are interested:
Hello
I'm looking for feedback on these two rubbers, what are the differences as they are the same hardness.
I've heard that the k3 had a ridiculous lifespan but the mk was pretty good.
Thank you for your feedback.