If your a hard driver this may be necessary unless your just doing it for looks. My Camaro had a serious glazing issue with the factory rotors and discs. So much so I had to run off the road one time at 100mph to avoid rear ending someone (anyone who attended Florirun 2008 can vouch for that), so to say that factory cars dont need upgrading is just horsecrap IF.....you drive the shit out it. I put drilled and slotted evolution discs on my car with hawk hps pads and it now stops on a dime regaurdless of how hot they are and how much I run the shit out of it. IMO the best thing you could do (is what I did) call hawk or some place similar and tell them why you want to upgrade and how you drive and they will recommend the best thing for you for example....I told them about Florirun 2008 and that my main issue was brake fade etc...
and that I wanted to put ceramic pads on my car and they said.......do not use ceramic pads in my case because I am overheating my brakes and ceramic does not dissipate
heat and they will hold the heat and the next time you brake all that heat will be applied to the rotor seriously increasing the chance for warping, they told me the hps composite pads were the best for my application. Ceramic is mostly for people that have show cars and dont want brake dust. I've had mine for almost a year now with no problems, no complaints and no more braking issues. To say factory cars dont need them seems crazy to me unless you got a 75-100k car that came with performance braking systems, most factory systems are inferior....IF.....you drive extremely hard or alot of long time driving where high heat is an issue.

I'm sure some people will will not agree with me and I'm not claiming to be the brake guru, this is just based on my personal experience, so don't get all bent