I have a 2012 CK35. Had an HST fluid drip at 4 hrs. Tractor was split and fixed under warranty. Have not had one problem since. Today, that tractor would be considered loaded since it has just about every option available as standard equipment, much unlike the newer tier 4 units.
My only complaint with the tractor is the loader. A bit wimpy with a load rating of 1150 lbs. I have my relief pressure turned up to 2750psi and it seems much more responsive and usable.
Curious what his uses will be. If handling round bales, I would recommend a larger frame tractor with a greater loader capacity.
Other than the loader, which was addressed in the new CK3510, I have no complaints and am a very happy owner. Good luck.