Well ive just changed my disc and pads from OEM to 3G just because i fancied something different to be honest.
I had no choice but to get them changed because my OEM ones were so warped it was unbelievable, my brake pedal just felt like it was trying to push my foot back and my car just did not want to stop!
And i also read on here that there is nothing wrong with OEM discs but another good set up is 3G with CW pads and when i spoke to Chris he seemed to think it was a good set up, so thats what i went with but i would happily change back to OEM as long as they didnt warp like they did last time.