Originally Posted by AP - Chris_B

One of the troubles with buying "eBay rotors" is that there is no such thing -- just companies looking for the lowest cost marketing outlet. While not all sellers are bad, many are small operations using Centric (who is not a true OE supplier to my knowledge and is not a manufacturer -- they just source from low cost manufacturing countries like many others do) or other blanks and sophomoric finishing techniques. There is very little in actual quality control as they do not have the staff to perform those tasks. They also struggle to provide customer service after the sale in the event anything goes wrong.

Others turn to NAPA or other big chain store, who buy cheap white box rotors in bulk from the lowest cost supplier of the day. One set might give good enough results, but the next might be horrible. Of course, they just replace a bad set, which is great for those customers who have plenty of unallocated time on their hands and don't mind the hassle of taking the same parts on and off their cars repeatedly.

Most people are better off shopping for quality parts to begin with. Obviously, look for the best deals you can as there are specials from time to time. But trying to save money up front that ends up costing more later (in time, effort and money) is not usually the best way to go.