Pros: Effectiveness, Overall Quality, Ease of Use
I have both the 4" and the 3" stones. (one each). I'm going to buy a couple more to keep in go bags. I have used for many years Arkansas hard stones, black stones, ceramic rods, and other kinds of sharpeners, but found only after a few months of using these little beauties that they are really the best yet for me. A few strokes on the ceramic side keeps my 3.5" EDC knife razor sharp. The diamond side is good for really dull blades, setting them up for using the ceramic side. Both stones (4", 3") are easy to carry, but I carry the 3" in my pocket all the time. Nice that they have a handy leather slip-sheath. They don't require honing oil. As I say, I'm getting a couple more because, for me at least, they fit exactly my needs My thanks to the reviewer who mentioned using the diamond side of one stone to rub the ceramic side of another stone. That was necessary and quick, making the ceramic side perfectly smooth. As yet I can't address the durability question.