I used hawk blacks last year, got 3 sets at a really nice price, cause they're discontinued. They were pretty rotor friendly, but only lasted a weekend. Very good modulation, in fact, they felt SUPER.

I was thinking of switching to Blue.

I also tried Carbotech Panther Plus, but I was not impressed. They basically fried, even with a proper break in. I would not buy anything from them again, mostly because they adveritse Hawk and EBC, but will not actually sell them to you.... they want to sell their product.