I've had my Kubota for just over three years now. I have never had any problems with it. It just goes and goes whether it's mowing, moving dirt or gravel, or clearing snow.
One slight shortcoming is the fuel filter location. The one before the fuel pump cannot be changed without removing the mower deck. Not a big deal most of the time except I got some bad diesel one spring and had to change it twice outside normal maintenance. Routine oil changes and lubrication are a breeze.
We have some rough spots on our property. It would be a bit smoother ride if the front wheels and tires were a larger diameter but there would be downsides to that as well.
If it were stolen I'd buy another without hesitation.