I didn't know they put out the 180c a 4 mix saw. My 86 year old dad & I bought a new 180 last winter with the easy start and it is the standard 2 stroke. The only saw that he can start cold without assistance. He had the dealer put on a 16 inch bar with a bigger then standard chain. He seems to like every thing about it from the power to the handling. Compared to his little Husky ( I think its a 42 with a decompression valve) it starts in fewer pulls for us, runs smoother, handles very nice. It is I think smaller displacement then the Husky and considerably lighter.I am sure it would do a little better powerwise with an 14 inch bar. Not meant to be a professional saw I do not know how well it will hold up if you push it long hours.
I have used the 4 mix pole saw which I really was impressed with its torque. I think the 4 mix would run cooler and be more reliable for extended use. I believe it is meant to take the same mix as the new stihls or husky 50 to 1,if not that is what my employer was using at the time.
I personally seldom use that small of a saw(180) unless I am up in the air, or packing light when maintaining trails. I like the 026 pro for most of my small saw work,(similar to 260 pro). 250's handle nice and have good power with an 16" bar and are not to expensive, their not considered professional models although I feel if you service the air filter regularly, (which is easy) they make dandy limbing saws. My experiance and observations is most stihls spend less time in the shop then huskys and they have better resale value old. Power and handling is close,neither is perfect.