I HAVE TO AGREE THE YAK AND THE EXTRA 330 ARE MY FAVORITES I DONT MODIFY THEM BECAUSE I DO NOT KNOW ENOUGH ABOUT THEIR TRUE FLIGHT CHARACTERISTICS TO ASSUME HOW THEY SHOULD FLY. SO I KEEP THEM ALL THE WAY THE PROGRAM SETS THEM AND I HAVE A BLAST. SOOOO MUCH MORE OF A TOOL THAN RF I CANT BELIEVE IT. I HAD RF FOR ABOUT A YEAR AND THEN GOT AFP, IT WAS LIKE LEARINING ALL OVER AGAIN EVERYTHING I THOUGHT WAS REAL WASNT I HAD TO CHANGE EVERYTHING I LEARNED IN RF. AFP IS DA BOMB!!!!IMO.