Mad Dog pads did not work well when I tried them.
My are of irritation is 2.5-5k, quite a few planars are a bit down in all or parts of that area which may help me be fond of them.
What really caught my ear first is how the Ethers really cut down treble ringing and decreases for lack of a better term IM distortion in the mids and highs - on the HE500 and HE-6.