I purchased my Kioti DK4210SE Cab model about 18 months ago.... and it has been absolutely flawless. Only recently have I ever used the heater but I have used the AC a lot! I can't say enough about this brand/model. My previous (first) tractor was a Kubota 2501. Another wonderful tractor that I only had for about a year - but which taught me what i wanted/needed in a tractor. Like many owners, perhaps my largest concern was about the emissions and if these would present a reliability problem. I do lower the rpm to idle when I hop in and out of the cab to pick something up or to change the bucket to the forklift, etc, but when I am operating the tractor I do keep the rpm at the lower eco-pto mark on the tach. I think this is roughly 1700 rpm. Admittedly, there are likely many tasks I could complete at a lower rpm but I think this RPM helps the engine to be a little cleaner. With about 150 hours on the clock, I have witnessed ~3 DPF cycles. A light comes on in the dash and my strategy has been just to keep working. In each case, the cycle completes itself in about 5-7 minutes with absolutely no inconvenience to me. Once completed the light goes out.... and I won't see it again for another 20-40 hours? I am conscious of these DPF cycles and I have tried not to turn off the tractor during one of these infrequent events... although you are supposed to be able to.
Anyway, I would highly recommend this tractor. I think you would really love it - as I do!