I have only used european wheelbarrows, but I find them deceptively unstable at high loads. You might bee able to push 100 kg of dirt since you only have to lifthalf of the weight, but as soon as you get just slightly off ballance, the full weight will push the wheelbarrow over. There is just no way you can keep it from falling once that happens.

The problem would seem to be Much worse with the chineese design, since the load is much higher (and the center of gravity higher ?).