I'm not sure if anyone has mentioned the true purpose of a bow saw so I will explain what I have been taught to use for. The simple answer, cutting brush. have you ever used your chainsaw saw in the woods to cut a path through thickets or brush. It doesn't work so great. most of the thin undergrowth gets stuck on a saw tooth and comes around to slap you in the leg. You see on the bow saw, on the bottom there is a small curved arm to stop the small brush from coming back to the saw head, when the brush hits that little guard it gets cut. I also remember seeing this attachment in a stihl brochure some years ago, and it was specifically advertised as for cutting brush, thorns, thickets, and undergrowth. I don't believe it was ever really intended to be used for cutting logs, but if that's what someone wants to use it for have I won't judge them, it looks like it's fully capable of doing it.

Back in the late 50s early 60s we had a family pulp wood operation in SW Louisiana. We used gear drive McCullachs. With a sharp chain you could not stall that saw. They were heavier than Homelites or Stihls. You could fell trees easier than a bar, not having to worry about pinching the bar. We used small bar saws for limbing. I have cut 2 or 3 hundred thousand trees, only nicked my Levis once.

It's super cool, but also a big decapitation risk with that huge engine and cutting at that height. My 390 bow saw scares me a little...just enough to stay vigilant.