Well, I can't claim to be any expert on chainsaws in general; but I do have an interest in, and liking for, things Mobilco!
As CJ is aware, my family had a business that was a Mobilco dealership from at least 1973 [I'm not certain when the predecessor business we took over first had the Mobilco agency; it was founded before 1956], until they were closed down in 1977. I did get to attend several of the Echo servicing schools that Mobilco ran, in that time.
The Mobilco Echo saws were very well designed and built, and leading-edge in compactness and light weight for their era.