I run the big husky rancher with a 24" bar, it is a brute. I usually cut oak that is over 30" across so I need the big saw. Problem is, it will wear you out. Spent this afternoon cutting and rolling 35" rounds onto the splitter. Can barely lift my arms right now. Going to have to start cutting smaller trees!
Your Stihl is a beautiful machine. While it is new follow their requirements exactly, it will make any warranty work much easier to deal with.
The safety equipment is really nice, I use goggles and they fog badly.