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I used to hit the drag strip every week and from personal experiences I can tell you that the dustless pads perform about 85% of the original pads. For normal driving you will not noticed any diffrences. When you put 20s on your car, the dustless pads perform even worse. The only trade off is that MUCH LESS dust and less noise.
Drag strip braking doesn't seem to be very relevant. I've never been to a drag strip that didn't have a long brake zone. There is no other type of performance driving where the brake pads should be totally cold.