Who is checking, that the engine meets the epa standards? Customs or is there anyone else??
We have Euro 4 standard here, but noone asks if the JD 290 engine of the Xingtai has this pollution standard. It could give a problem, if I need a road registration, or if I will import them in larger numbers, but at the moment noone asks about.
You are right with Your statement, to buy at the dealer is the best business. They care for warranty, repair and spareparts, if needed.
Here the chinese tractors are expensive, I do not want to know, how much % they add to the price they have paid at the factory as their profit. Dealers network is poor, for Kubota and Iseki, too.