Yes, I have bought the kit and done it!!! Not an easy mod and I opted for soldering to the circuit board. The back is quite thin so bulges slightly but overall, a cool mod. Certainly not a mod for the faint hearted since you can easily ruin the phone. Basically, the Apple logo lights when you press the power button, home button etc and lights up when called or calling. Apple should do it (and charge loads for it) but I doubt they will.
