I have a YS91FZ in mine. It's true about the throttle response and performance. I have seen one with a Saito 100 and it flies really well also. I just think the YS91 has a slight edge. Mine had only a few tanks of break-in on it before flying and it was terrific with the 15x8 APC I ran.

I did use larger Hangar 9 lightweight wheels than what it came with. 3-1/4" I believe.

Takes off with very little throttle and very little rollout. Will go vertical immediately on take-off.

Sadly, winter came to Chicago before I had more than a few flights on it. My buddy, who is a much more capable pilot, demonstrated the crow, etc after the maiden flight to show me some of the capabilities. Pretty neat.

Both elevator and rudder servos are mounted in the tail in a pull-pull arrangement. Look up postings on the US60 by Termagator and you should find it.

FYI - visibility stinks
I am in the midst of doing some additional covering on the wing to improve visibility. Everyone I have met who has flown a US60 just loves the way they fly, but complains about how difficult they are to see, because of the transparent yellow top/bottom. I wish H9 offered a plain white one that could be decorated as desired.

Good luck and enjoy it. Great flyer. Either the Saito 100 or YS91 will fly it forcefully, although I agree that the edge would probably go to the YS91. It all depends on what you prefer and are comfortable with, though.