I can't comment on the sensor bit, nor can I comment on track usage on the Duragos (meaning cracking - mine have no cracks from street usage only)
I've had Duragos for about 1.5 years now (slotted+drilled) for the front of my car. They look cool, but they have seemed to wear faster than I'd expect with the mileage I've driven. They also seemed to pick up pad deposit faster/easier than my factory roters I had before (same type of pad). I bedded and re-bedded properly with minor improvement.
If I had the choice again I'd stay away from them despite the cost savings, the quality isn't up to snuff IMO
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