I agree with Skribnod about the instant responce in case of a emergency situation because when I was still flying my trusted trainer I ran out of runway and there are big humps at the end of the field where I fly and I had to give it full throttle and take off in about 5 feet and that APC 10x6 took that trainer vertilce in about 3 feet.
If it hadent of worked the Superstar 40 would have ramped off the hump into some thick pine trees.
(by the way it has an O.S 40 in it and i can take it verticle......thats pretty good if you ask me!!!)

Jim