I own a CK25, 3+ years, ~340 hours. It has a Kioti loader and a Rhino backhoe on it, with loaded R4's. It's a great machine for ground engagement work: Heavy, good hydraulics. My experience over the 3 years of ownership has been that Kioti is trying to make an excellent machine, and mine is one.... now that Kioti has fixed some things.
Kioti has used some inferior parts over the years. Read through the Kioti forums and you find stories about First generation loaders that develop cracks, injector pumps that have brittle gears that break, problems with the plastic balls in the loader joystick, cover plugs for hydraulic lines dry rotted at delivery, keyswitches that easily get fowled such that they become intermittent, etc. Kioti has since remedied most of these and stood behind their customers, which I think says a lot about what kind of company they are and want to be. All brands have problems. But, as has been observed and written, Kubota and John Deere report fewer problems, which is indicative of their experience and supply chain choices.
All in all, what I would recommend is that, if avalable at a significant cost savings, I wouldn't hesitate to buy another Kioti. But, it would be a model that has been around for 4 or 5 years so that they've had time to remedy any design issues.