It is a VERY good value - BUT: it depends on your dealer. I had a couple Kioti dealers quote more than the big 3 tractor companies. I had small dealers quote great prices, but didn't have a shop to work on them. Dealer is VERY important.
You are in a unique position, since Kioti's main US office is in NC. Parts and support are physically not very far away.
To nit-pick what I looked at in Nov/Dec: I think the seat could be better quality. I think the tilt-wheel adjustment handle is suspect. Other than that, I don't remember anything that wasn't world class. I could nitpick and find other problems with ANY brand, but if you like the tractor AND the dealer AND you get it for significantly less than other brands, you will probably be happy.
As far as the tire debate: Ags definitely mark up the ground, but provide good traction. R4s mark up the ground too, but to a much less extent. They will slip and dig in when under load, but I rarely run out of traction. I am still playing with air pressure to find a happy medium. If you fill them with liquid, R4's hold more and therefore more weight.
Hope this helps,
Mark