I've had mine for over four years and it's done phenomenal each time. I own three different CRKT M16 variants, and use this sharpener on all of them. And it gives them all an excellent edge. Use the coarse to kill any burs on the blade, and then flip to the fine side. From there on, only use the fine side. Don't go back to the coarse side, people. It kills your edge, and then you can't cut a piece of paper. I just trimmed an old 1.5" leather belt with my daily carry CRKT. So to say this is a piece of garbage for a sharpener is laughable. Especially at under $5. Hence, why I purchased a second one with the newer ceramic rods for my bug out bag.