Hello GA plowboy,
There are some that have purchased and are happy and there are some that have purchased and felt cheated and very disappointed. Same with after sales support as failed parts have been shipped in a reasonable amount of time, and other new owners have been stalled to beyond the limited warranty, abandoned by their Seller and left to fend for themselves.
Many dealers won't import them, support or repair them or spend long hours locating difficult parts that may, or may not fit them. Other dealers buy as many as their initial investment will cover, turn them quickly to the unsuspecting or uneducated consumer, then leave town -
If you are really interested, I would urge you to search the Yanmar forum and use key words like Refurbished, Rebuilt, Reconditioned AND Vietnam. There are many threads and hundreds of posts concerning owners input and their actual experiences, some good and some, well, you'll understand better as you read on.
Mark