As a manufacturer I have some input you might want to consider.
2 years ago we sent our vendors (we buy a lot of steel) a letter stating no chinese materials will be accepted. We employ design technologists, engineers, fabricators, welders, equipment technicians and such. We used CNC tubing benders, press brakes and othe such tools which will give you a very fast indication of material deffects. We manufacture products with a very high liability factor so we conduct SAE and ISO tests on a regular basis. We use a lot of DOM tubing which is ISO registered and controlled with batch and heat numbers recorded right on the tubing and we discovered crystalizing and "shrinking" in our bending equipment, we only get .005" of tubing diameter variance but with the chinese material we experienced up to .227" tubing diameter variance which is very visible and very structurally compromising. We also get surface cracking and flat spotting that we also get with steel plate that comes from china. What this boils down to is a failure to adhere to the ISO policy that these foreign manufacturers advertise which is not acceptable to us. It is due dilligence on our part to not buy raw materials that do not adhere to a policy that we stand by, which in our case could have catastrophic results. So in a nutshell you are buying a product made with substandard materials, poor machining backed by false advertising. It's your choice, a cheap product isn't that cheap when you have buy it twice or replace it later.