Cool video. The talk of angles and bevels illustrates the comp filers need for precision. Warren Miller's vids are quite different, I dont think he mentioned any angles on the teeth, only that he sort of rolled the file to give a slightly almond shape to the tooth. When he talked about hammer setting, I think he said to hit the tooth "at a 30 degree angle, or something". I chuckled at that. Yours truly is not particularly fond of angles and measurements =)
I'll have to take a video of double bucking with one of my saws in some pine soon. Not as sexy as these saws but working saws nonetheless. I would wager they would cut longer with less maintenance =P