I have to admit that I've never touched a chain saw before in my life. So I went at a fairly big sized maple, about 20-24" diameter and about 12' long. First, I tried my 5' peavey and no way I'm moving this thing, there is just too many limbs on it that keeps me from getting any leverage on it. Of course, the limbs have been cut, but the stumps make the log not round and impossible to move... Anyway, I'm actually not doing that bad til I got to the very large trunk part where I literally started to cut a spiral in it I had about a 6" gap between my cut on the left side and my cut from the right.... Horrible I am embarresed! Of course, I'm cutting this honking piece of wood with my little 16" Makita UC4000 because my Husky 350 that I bought didn't want to start... (used but serviced from Husky)... Anyway, what are that little row of spikes on the saw body for? I've kind of found them somewhat handy to kind of stick them into the trunk and leverage the bar nose down a bit with this.. Is that the purpose? Jay "The cutting newbie" H I had a lot of fun though!