oldud,
I have the cat 0 3ph version of the Johnny Bucket Jr. I was using it on an ATV with a 3ph on it. It worked great, but the ATV didn't like it very much. With the bucket full enough to be of use, it took so much weight off the front end that I couldn't steer. I decided it wasn't worth having to put a new rear-end on the ATV, so I no longer use it. Although I have no first-hand experience, I would guess that on a garden tractor it would work really well.
Kevin