They are a re-seller so it depends on their source. They buy at whole sale pricing and then mark it up for you to buy. So just like all re-manufactured parts it will depend on their source for the part which I am sure they don't want to share that info.
And the quality changes with every batch purchased, as it is all made in China. China is not world reknown for quality. Instead you go to China to buy parts cheaply made. You can thank Sam Wall and everyone who goes to Wal-Mart to buy their stuff for this situation.
You may want to wait till you see a 35% OFF on the website to buy your needed parts, if your not in any hurry. I have bought a lot of parts from there for my '65 Impala SS and have been quite happy with the parts.