As there are no pictures of the turbine wheel we are suspect that they maybe the OEM TD03L, this would be a horrific mismatch for the 16T compressor wheel. Provide some pictures and we can help you out here but understand that with the language barriers many of times it is very hard to to determine what they are trying to sell you (ie. they mention TD04L16T but they are talking only about the compressor wheel).
For giggles we had purchased a set of the China turbos last year, and what you will find with them is fairly shoddy balancing. More information on our findings here:
http://www.n54tech.com/forums/showpost.php?p=578237&postcount=8
Also it is doubtful you'll get internal bearings to withstand the test of time, then add in the poor/inconsistent aftermarket VSR balancing, and then add all of this to a mismatched wheel combination you could end up with surging to even a quicker death. Eventually they will get it all ironed out, probably will be around 2019-2020 or so at best; as of now this is the infantile guinea pig days and they will always be built with mass produced junk Chinesium housings and sloppy new wastegates.
All in all you are correct about giving them a whirl though with all of the "other" failures with vendors, considering some of these vendors who have "
Gone
Chinese" are simply relabeling and reselling for large profits are having an absolute ton of problems. High stakes game here with the amount of labor involved in these swaps, and the alternative is to buy from vendors who are hand building to perfection with the correct wheel combinations/balancing strategies/internal hardware and NOT having problems.
Rob