seems like a great idea to use square ground chisel for a climbing saw, which seldom encounters the outrages of rock and dirt. but why do you use low kick-back chain? i think oregon still makes a professional lo-pro chain. carlton seems to have dropped it's full chisel lo-pro, a shame. i thought it was better than the oregon and the top plates were longer.
It's green label chain, but don't let that fool you. The little bumpers on the drive links are so small and sit way below the actual rakers. I guarantee they in no way make the chain slower. I've been running 91vxl and this stuff is faster and smoother. I asked my dealer and he had no clue what PS3 was. He looked it up and said he could order it for $22 plus tax for a 52dl loop. I said "Pfff!". And got on ebay. I found 2 55dl loops shipped for $35. I took them to my dealer, bought some crap and then asked him to shorten my chains which he did for free because I spent money on other stuff. Woot! My echo guy said that they can do $400 on the saw, it'll be here in Thursday.
I haven't cut with my square filed chain yet but I'm sure it's performance will be nothing scoff at. I just like the idea of having the fastest, smoothest chain I can when in a tree taking a top. Plus the fact that it'll never see dirt or rocks. Btw, I file by hand and had this chain done in about 20min.