B.john,
It is admirable that you stand by your purchase and defend your choice of tractor and dealer. It is, after all, a Yanmar discussion forum.
The fact is, a large percentage of tractors imported from Vietnam are exactly as others have stated. And many have had varying degrees of success with those same units. There are some pretty satisfied owners who post often and don't care about the origin of their tractor, refurbishing process, or can tell any difference between theirs and others imported as used.
IMO, it is the owners that have had horrible problems, catastrophic mechanical failures, no after sales support and individuals just stuck with a tractor so poorly miss-matched with salvaged parts...that the rest of us heed their warning. Mostly these owners just drop out of sight and are never to be heard from again. That sends a pretty strong message to the rest of us. We also, have been privileged the information about dealers that visit Japan often, and Vietnam on occasion, who provided us with their opinions (most greatly respected) and that sends a pretty strong message also.
I wouldn't be too sensitive, as the members here are offering their opinions and warnings, collected from a history of some dealers and tractors that are dumped on unsuspecting first time buyers with little or no experience in the tractor field.
Mark