I would give the semi-chisel chain a rating of 2. I tried a semi-chisel chain because of it's reputation for maintaining it's sharpness longer than a full chisel (all the while knowing it is a less aggressive cutting chain). Unfortunately the chain dulled rather quickly compared to the full chisel chains I normally use. I tried it and was disappointed...the blame is mine not Jack's Small Engines who I find offers great customer service and reasonable prices. Keep up the great work Jack's!