Just bought the Stihl 140C at the Fieldays last week, so 2 days work with it doesn't really count. But its nice to have a saw that just sits there making no noise till you do a cut then shuts up again. But they are not as quiet as you would expect. Will still be wearing my helmet and muffs. Keeping them razor sharp and not doing any cuts near the ground seems to be key to maintaining their productivity.
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