I have an 06 CK25 gear. Love it. I have had some issues, which I 'd charaterize as early design bugs, such as loader cracking and fuel injector pump failure. But, Kioti made good on them and the tractor has been rock solid, now at 430 hours. I'd say it's been long enough for all the design bugs to be worked out and you'd be hard pressed to find a better tractor.
The one area Kioti could do a better job on is paint. The finish is good, but the weight of the paint is too thin. The paint on my John Deere is easily 3 or 4 times thicker than on my Kioti, and you know it if you scratch it. Not sure how the difference is created, whether it's better paint product, number coats, process, or all of the above. The difference though is very obvious. I dumped a few small 57's stone (size of a quarter) on the hood of my Kioti from a few feet up out of the bucket. One wouldn't have thought it would have perforated the paint, but it did all over the place. That would not have been the case on the JD. Doubt it would have even left a mark.