"On the other hand, Stihls can be tempramental when they need some small adjustment, cleaning or a new plug. Echo tools seem (to me anyway) to be more tolerant of neglect."
Yeah, that must be why so many pros are running around with Echos.... not.:jester: It has been my experience to be quite opposite. I've got 25 year old Stihls that are still kicking and cutting a he11 of lot of wood every year with no more maintenance than an occaissional plug, changing filters, B/Cs... Show me an echo that'll put that much service in professional use. I'm not pooing on Echos, but from my experience you get what you pay for and I have yet to see one that I'd put against one of my Stihls or Huskys. That said, they produce a few quality saws particularly some of their top handles.
Some of the points about being leary of a used pro saw are valid, but the original poster did mention the seller as being a friend. I wouldn't think a "friend" would intentionally sell a friend a beat saw. Many pros eliminate saws from their arsenal once in awhile, usually to make room for new saws.
My advice, check out the saw, run it, cut with it and if happy buy it. If it is indeed a friend I can't imagine he wouldn't let you run 'er.
Good luck. If a decent saw, that's a decent price IMO.