My '09 GT/CS now has about 82k miles. It's a DD, and I don't beat it. Most of my commute is hwy miles. I have yet to do anything with the brake pads or rotors. They've been great. I'm just now hearing that sound you hear that they need to be replaced. #1: What is the sign I look for that the rotors need to be replaced? #2: Should I just change them anyway? #3: Keeping in mind I'm trying to keep costs down, is it worth it to invest in upgrades for either pads or rotors? I've never been disappointed with the performance of the stock units. If this was answered before in another thread, I apologize. I couldn't find anything in the search. Thanks!