I got the field king Max from forestry supplier site. Absolutely love it.
Spend the extra $ and get one that clips around your waist to take some of the weight off your shoulders, you will not regret it. I think they call it "lumbar support."
I love stihl and I'm sure theirs is great but the field king max is pretty amazing.
Aero next time I come up we can do a side-by-side comparison to see who can spray farther......ahahahahaha