Had a Kubota L2250 with over 5,000 hours, and it still ran well.
Then a 2800, had it for 700 hours or so and traded it to buy a 9540.
I've got over 700 hours on the 9540 and not a single problem.
Also, our zero turns get a ton of use and they haven't had a single problem.
Kubota stuff is about as solid as it gets in the world of machinery...
2009 Dodge 2500 4x4 Diesel
2007 Chevy 1500 4x4
Kubota ZD mowers
2006 Kubota 9540 w/8 foot galvanized Modern shredder
Gravely 36 inch walk-behinds
Echo and Shindiawa handhelds
16x8.5 Heavy Duty tandem trailer