Bought this little guy for field sharpening axes and rough use outdoor blades. I was a little skeptical of the 600/1200 combo but man these diamond stones cut fast. I have a small field plate at 320 grit for rougher fixes, but this sharpener does a fantastic job at restoring a well used edge and is small enough to pack it with ease. Works very well on axes, knives, and even convex edges as you can loosen up your wrist a bit to achieve a workable convex with ease in the field. Very pleased with this device. Only removed a star as the plastic folding pieces that become the handle are an obvious weak point. Once they break on me, I will machine something more durable to replace them. This would be a 5 star review if this sharpener came with a more durable plastic or metal for the handle parts. As far as the diamond surface on these goes, I know DMT does their diamond bonding very well. I can see this tool serving me well for a good long time before needing to replace it. For the price I paid for this, it's well worth the money! Great product. Excellent service and shipping times.