I heard about Chinese raft manufacturers were selling the same rafts from their shops in America bypassing the companies who were appropriately trademarked in the U.S. and who designed and spec'd the rafts. The rafts were sold through craigslist etc in the Denver area. They were not sold through the appropriate distro source, so even though they had the name brand, same build etc, they would not be eligible for warranty, customer support etc. The sellers were really clueless about the rafts and rafting because they were only manufacturers and not the designer or boaters.
Ask some basic questions and you should get an idea if they have any clue. Performance, materials, warranty. Probably not.