Bluechip,
Thanks for the response. My profession is marketing and I also wonder if there's a market for these products in the US. For a full size tractor, I was always very reluctant to buy Chinese because a) I don't have a dealer close by if something breaks, b) I was worried about resale value if I didn't like it and c) I could buy a used branded tractor for a similar price.
But the situation is different with these tractors. The design is less complicated than a full size tractor. And the small size makes it easier to tackle repairs (remove wheels, engines, etc...). Also, the lower price means less money is "at risk" if I didn't like the tractor. Further, the competitive options (e.g., BCS) are very expensive. The price difference between a Chinese 2 wheel and BCS 2 wheel may be substantial. Also, the Chinese 2 wheel tractors have a LOT more capability than a conventional rototiller. For many folks, they are a nice alternative to a conventional tractor for garden and light field work.
Like so many things, I guess it comes down to price in the end. If the price were $1500 to $2500 with tiller, then I think there's probably a market. If the price is more...then I don't know.