I'm going into my 3rd season on a fs100rx a great daily use trimmer. I have yet to do anything other than add fuel and air filter. Don't buy into all the hype of valve adjustments. I have very little run time on redmax but they do make a nice lightweight machine, I'm just not sure how well they stand up to daily use.
I've never been skydiving, but I have zoomed-in on Google Earth really fast.