I cant be model specific on the Husky's because of my ignorance of that line but I have been playing with Oregon ,325 .050 narrow kerf chains a bit, called 95VP and micro light bars. My opinion of them is that the system is best used under 50CC, I believe that is how Oregon markets them. I also believe that it belongs on a limbing saw where a person has another saw to fell, chew through large knots, dig in the dirt etc. Think of Oregon's system like a high speed scalpel as compared to an ax (your old 3/8 setup) A bit delicate but darn fast and takes little power. The saw that has the most use is our Echo 400EVL that originally came out on .325 chain. I'm not into saw sciences so I didn't put a watch on it but suffice it to say it cut notably faster than with either Stihl RS .325 (old stock boys) or Oregon's std 325 offering that I don't know the number of due to CRS. The old Echo isn't a power house even for it's size but the big change came when I got brave and slipped an 8 tooth rim on it, now it's top shelf limber. My experience with the Echo led me to try it on a 112 Dolmar that I just got running before I walked in tonight. A 112 is 3.1 cubes this one was seized and I installed a new cylinder and piston, seals, carb kit and a new Oregon micro light 16" combo. The 112 has a std spline clutch and the smallest rim is 9 teeth for 325 so the chain speed is going to be high. Saw was started first time tonight and I intended to just let it run a bit but the woodpile beckoned and I put it in the wood. Cutting semi dry split cherry, about 6-8" stuff the saw simply falls through it with 5 minutes run time on the new motor. The 112 is going to be real fast when broken in and I get at that 95VP with my files.
I guess to answer your questions, Yes the narrow kerf chain is fast, real fast when you take the chain speed up also. Its not heavy duty although I guess that depends on the power behind it too? For a guy who takes two or more saws to the woods I highly recommend it on his light saws. For the one saw fire wood cutter? probably not unless he is more careful than Joe average firewood cutter.