Four strokes are not hard to use. I use OS, Saito and YS. They seem to run the same glow plugs forever and I will adjust the valves about twice a year. I just like the way they run so much better than 2 strokes. The only downside for beginers is they can experience greater crash damage. Bent pushrod tubes,valve covers etc. You can usually dig a 2 stroke out of the dirt clean it up and mount it in a new plane. I even put a 56 saito on my son's Sig Kadet. It really flys it nice.