I have three chainsaws and maybe 6-9 chains. I once used a Dremel with 2 different stones for the two chain pitches on hand. I was never really happy with the results, mainly due to lack of skill on my part to properly sharpen the underside of the upper edge. A few months ago I bought from Lowes an Oregon molded red plastic jig that controls multiple angles, etc and it clips on the chain bar. I also bought spare files. The good news is that it works fine but the bad news is I think the OEM directions are wrong, it often slips on the bar or else it challenges you to change the setup or else the chain won't feed easily, etc.....You must pay attention to how the setup impacts the edge on the underside of the cutting tooth. You can end up with sharp edges on the outside cutters but poor edge on the actual edge that does the cutting. In short it takes some learning to use properly but once you figure it out, it works OK. If my budget was the same I would buy another. With a bigger budget, I'd move up.