I've had real good luck with the stihl fs80 very easy to change string
and the heads last a long time also very easy to advance the string.
They are easy to
start and the engine is used on a bunch of other stihl machines so
parts are readily available. I am a golf course mechanic and I think I
know a good tool.We have several at my course and I also have one at
home I have ten acres and I use it wherever I can't get to with my
tractor or walk behind mower