Does anyone use the Stihl SR420 for Tree/Shrub spraying? If so how do you like it? I am considering buying one, but would hate to frop $550 onlt to find out its not what I need. I do a very limited amount of Tree spraying, so I don't want to invest in a spray rig just yet. Thye website says it will spray 40ft vertical and horizontal, but I'm guessing its more of a mist. Any other suggestions for something easily portable for spraying a few trees here and there?