Initial impression... my new Stihl 036 PRO (62cc) has far less grunt than my old Echo 510 EVL (50cc). The Stihl is an almost NIB deal, the piston showing zero wear when viewed thru the exhaust port, and pulling 10.6:1 compression. This saw is clean thru and thru. The Echo is old and neglected, but relatively low hours, as the man who gave it to me rarely ever used it. Both are running brand new RSC-3 chain, both on 20" sprocket-nose bars in new or good condition. The Stihl has a new fuel filter, new air filter, and was just retuned by my local Stihl dealer. The Echo has not been retuned in probably 20 years. I don't have spec's on the operating RPM of the Echo, but the Stihl runs 13,500 max, likely faster than the Echo. Perhaps the Stihl will outcut the Echo, when I finally have time to put both to a real test, however I can say the Stihl seems WAY too easy to stall in a cut. So far, I'm severely underwhelmed.