I've had this now for 12 years.
I had to replace the head gasket due to overheating. The overheating was caused by the rebuilders using glue or sealant on the gasket which occluded the water flow. I have put over 80 hours on it since replacing and it has not overheated. I'm in South Florida where temperatures typically reach the mid-nineties.
I have a Koyker 120 loader and use an auger, box blade, and 4-foot bush hog. I have been very happy with this tractor and have put many hours on it. Obviously, given its size, it has limitations like anything.
Use it for its intended workload.