The KMX is a bit of a toy, it's heavy, cumbersome and needs constant fettling. I've put thinner slick tryes on it for the road to reduce the drag but it lacks that certain 'zing' that you find in the higher priced trikes.
But saying that, I've had some good road rides on mine which I bought second hand but I'd never commute or try to tour on it.
It could well be the Reliant Robin of trikes, only slightly less useful.
Having had the KMX for a while now I have decided that I really want a recumbent bicycle so it hasn't been too expensive a learning curve.