Glad you covered the area of putting it together. From the spray distance you showed, it appeared leaves were moving at 15'-20'. Spray or moisture was probably going another 10' in air currents, so about a 45 degree angle spray would get the most distance. Hopefully any minor issues can be easily DIY fixed and a deep clean of the carb every few months would help. Fuel nowadays has so much crap in it, it gums or varnishes pretty quickly.
Boy that seemed like a pretty poor showing. Killswitch nonfunc straight out of the box, and the power seems a little weak honestly. I've used a SR 450 for probably a thousand hours or more, and they have their issues, but if they are properly cared for they can last a decade or two of constant professional use. Maybe it doesn't pick up well in the video, but it looks like it was even more underpowered than the SR 200 (which I have used on and off), which is significantly lower power than the SR 450 already. I could get a SR 200 for just $50 more and probably just live with the smaller tank and engine size. How did this thing fair though the mosquito season there in Tennessee?