I've had Ankebono pads on 3 different cars and the reason is the lack of brake dust. The X5 exhibited a slightly softer pedal feel with stock OEM rotors. I have not replaced them yet, but when I do, it will be with R1 rotors.
The other 2 cars a 2010 Corvette had them on all 4 wheels with stock Z51 rotors and worked great. The other is a Mazda CX-9 (heavy) with R1 rotors, all 4 wheels.
I did not see any difference in the Corvette/Mazda, the BMW was not as "grabby."