After reading the reviews on the new Stihl Farmboss 391 ,I wouldn't want one if it was given to me for free.
Most of the reviews say they flood and the only way to start them is to remove and dry the plug then install and start.
One guy said when the saw isn't running he has to store the chainsaw on its side so the motor doesn't flood .
Another problem with the Stihl is you can only buy a Stihl saw from a Stihl dealer so if you are not close to a Stihl dealer
it could be a problem.
Cheers
Max.