I admit I used one for years after putting a bar and chain from another saw on. With a full chisel chain it would do OK. It ran...but needed constant tweaking and didn't always idle or go from idle to high speed very nicely. Of course at the time I knew nothing about carb limiters or adjustments. When fuel lines broke plastic parts broke and I tore into it to discover how it was designed, mainly not-to-be-repaired, I threw it away. I was amused at the free nuts securing the carb to the studs, nuts that if worked loose, could suck directly into the butterfly and maybe through to the engine. Nice touch.
Vibration - I wonder if anybody has fiddled with adding some sort of vibration control to these saws? Could make a nicer little saw.