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.
Knowledge is knowing a tomato is a fruit, wisdom is not using it in a fruit salad.