I asked for a Granberg sharpener for Christmas and Santa left one under the tree. I always hand filed my chains and thought I had it down pretty good. Today I used the Granberg for the 1st time. Wow, I was shocked how off I was hand filing. I did all my chains with the Granberg and did some cuts on doug fir stumps I have in the yard. It was amazing results. It cut better than a brand new chain. The chips were huge. I am more than pleased and would recommend this sharpener to anyone.