I flew nothing but two strokes after a bad experience with a saito .82 on my second airplane. i swore off 4 strokes and I was more than happy with my 2 strokes. Fast forward a year later when i have much more knowledge and experience with tuning glow engines and flying and now all i run is 4 strokes. I fly 3d almost exclusively and the four stroke wins in almost every 3d application. The spool up is what i really love. No matter how well a 2 stroke is tuned it will not transition like a well tuned four stroke. And I understand using 30% fuel is part of the reason why but that is one of the reasons I love using four strokes, 2 strokes just can't handle the high nitro as well. Some see 30% as a drawback because of price. With all this being said I don't think a four stroke is the right chioce for anyone's 1st or 2nd engine. They are not more difficult to tune but they do take practice to tune them right. Also some of them take quite a bit of break-in to perform like they should. Maintenance is another reason I would steer new pilots away from them. When you are learning to fly you have enough to worry about without trying to keep track of when you need to adjust your valves. Sorry about this rant and I'm sure some of you will disagree with me. This is just my opinion and I don't know everything.