Indeed, the Honda is a fantastic engine........in cars.
It's main asset is its' apparent schizophrenia, one minute a docile town car, the next it's screaming for the horizon leaving your eyeballs pinned to the back of your skull. Not the lind of predictable performance one wants when trying to pick up a couple of kts on late final!
(Apart from the fact that all propellor driven aircraft have dynamic limitations imposed on them by the fact that they have a propellor attached to them which doesn't like too many RPMs)