We must be kindred spirits for saws , besides my Mccullochs I really like the 441 variants.
I have rebuilt a carburetor version and a M-tronic"C" and I am impressed with both saws.
The good is they are about the strongest 70cc saw you can get used.
They are incredibly smooth and the ergonomics are spot on .
Being strato port design they are noticeably better on fuel then most other saws in their class.
They really cut above their class with a little bit of work. One of mine normally wears a 34" bar.
Stihl really dumped alot of innovation ( quality) into them at the time which are still being used in features of the current saws.
The bad almost no aftermarket support, so cheap plastic covers or handles are a no go. There is aftermarket cylinders and pistons but they aren't what I'd call quality? I haven't seen them all.
They are notoriously difficult to disassemble and assemble, hourly rate for replacing the fuel line would probably constitute a new saw for cost.
Replacing or removing the fuel tank can cause many repairmen to start praying to dark primal gods.
Patience is required.