I first tried my edge pro apex, the 710 refused to take my normal hair popping edge. Next I pulled out the sharpmaker no luck! This process was seriously frustrating to me, because normally with my edge pro & or my sharpmaker, I yield very successful results. I spent hours with my edge pro, I now feel like it was just wasted time with this knife/steel! I refused to sharpen my 710 on my paper wheel, because I didn't want to risk damaging the blade. After practicing with a couple of my $10 knives, I decided to give it a whirl, never have I been happier with how an edge turned out. My 710 is now razor sharp, and seems to be holding an edge like the m390 is notories for.