I also demod a Kubota 60" with the diesel engine (23hp?).
I was extremely impressed with the cut quality. The clippings were very widely disperesed and did not clump. The wet clutch engages very smoothly and the machine is built like a tank. The machine left a really nice stripe. A striping kit would leave a really striking effect!
The shaft drive also has a host of advantages.
The biggest drawback I found was the stiffness in the hydro controls. I did not like this.
Ive demod Toros, Feris, Exmark...and by far the the directional controls were very stiff compared to these other units. (The Toro was feather lite and very nice!)