OK, I'm not going to say for or against. However, I have noticed no one has described "HOW" they fly their bi-plane, so I will describe how I fly mine. I have a Pica Waco YMF 5 1/6th scale bi-plane powered by a Super Tigre 90 2 stroke. She weighs about 11 pounds. She is a little nose heavy. On take off, I leave the elevator on low rates. During takeoff, I hold full back elevator until she has flying speed. I allow the elevator stick to go to center and she lifts off gently and gradually, (no sky clawing). I use her rudder to turn into the pattern to down leg. I fly her pretty musch like any other airplane. She performs rolls and loops with ease. The ST 90 is more than enough power. When landing, I turn base to final while backing off the power slightly. She lands down center runway every time with a three point landing. This is one terrific airplane. Best of luck to all of you.