So I need to replace my front discs due to both being warped. They vibrate a lot and squeak. I am going to be taking a road trip and will be changing them before I leave. I was on ebay and was looking at R1 concepts "eline" and "premium series" discs. I am getting blanks and was wondering if anyone has purchased these and if so, how did they hold up? I am leaning more toward the "eline" but I am really liking the black coating on the premium series. Any help/comments are greatly appreciated.