kicking around the idea of getting one for farm and hired work. have 299 high flow not xhp. Does anyone on here have experience with Denis Cimaf and or Fecon heads. looking at cleaning up buckthorn and underbrush 6" and less usually. to ground level at least. It'd be nice to run knives vs carbide but im afraid any rock contact will never make knives worth it. Depth control head vs the normal open tooth design? not looking to take down huge trees as i know its not very efficient. Also width wise my machine is 78 inches i think so is the 60 cutting width heads just to narrow to use efficiently ? thanks