I've run Kubota's for the last 20 years, all HST's. I've done some things that were just plain crazy and never had a problem with any of them. That said, I have on ocassion, popped a seal or two on a loader cylinder, but it always has happened when the tractor was still under warranty so it's never cost me anything.
I have orange, green and red tractors and they are all good . I just like running the orange ones better.