Good question Pete, I've asked this myself as I'm looking at getting some and will.
I'll only be getting 11" brakes as IMO that is more than adequate.
The simple reason is brakes don't just do one function - stop you. You need to brake before you enter corners so having these modern, quicker, more positive feeling brakes help significantly. I'm not too sure though why some go for the track style as I'm pretty sure you'd need to run some serious heat through them to work how they're suppose or designed to, unless, of course they're just a label as a consumer selling point. "Just call them race brakes.....we'll sell more that way" lol.
True race style brakes need to be used at extreme temperatures to function properly, cold they are basically useless. Also, for normal driving where you're not slamming on the brakes ie: reversing or coming to a stop light or anything else that isn't a "emergency stop" it's nice to have a firm positive pedal, not a squishy sponge.
