I RECENTLY BOUGHT A TWIST FOR MY SECOND PLANE. MY OPINION IS THAT IF YOU THINK YOU CAN, THEN DO IT!!!! AS LONG AS YOU SCALE THE PLANE PROPERLY, AND HAVE A GOOD RADIO THAT YOU CAN DO SOME MIXING WITH, AND DUAL RATES. GO FOR IT. I HAVE SEVERAL FRIENDS ONE OF WHICH HAS A33% EDGE 540 AS HIS 3RD PLANE... ITS NOT A PROBLEM AS LONG AS YOU FLY CONSERVATIVE......