The tool is good, you need to drop the cutting edge before use. how long they keep sharpening, until I can say, I didn’t use chisels so tightly. I took them at random for a promotion, so the requirements for buying are not high. Different pros: good case, the chisels themselves come with tips to protect the sharpening. I got the chisels for a promotion for 1300, and this is a huge plus Cons: immediately after the purchase can not be used, poor milling, you need to finish on the stones.