Square Chisel cuts at amazing speed in clean wood. My father used to use it exclusively for felling. It takes a while to learn to hand file it, and if you try to cut in dirty wood, or if your prone to grounding your bar then you can plan on filing it a lot.
Id be using it except that my 62 came set up for 325, and I can only find Square grind in 3/8. It just a matter of changing the rim, but on a brand new saw, I decided to wait till the rim was beat up before I changed it over. Then it will be my square chisel saw, unless I acquire a big boy before then.