No experience with a 4 stroke, but I have a 2 cycle Poulan Pro straight shaft with the brushcutter head and chainsaw attachment. I was amazed at what the saw will cut! I have cut limbs that it didn't quite reach through all the way with no problem. Just don't let one pinch the saw or you will be turning the air blue with colorful metaphors trying to get it unhung!:D
also, they cut kinda slow, so don't expect to cut through a limb and have it drop straight down. they WILL swing back and knock the stuffin' out of you if you aren't careful
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