This is the 4th pads I bought for the M50 and while the premium one is very nice quality wise, fit is superior with it's larger ear cut out as well, however the sound changed for the worse, compared to the stock pads, and also to the cheap velour ones that massdrop sells here occasionally. With these the bass becomes very bloated talking 100hz and up while the lower bass lose it's impact. The treble also gets rolled off just a bit. Too bad they look and feel very nice.
Edit: I must augment this post after I reinstalled the pads again. While the sound signature remains the same I posted above, I must say with just a little EQ it can be remedied, so I'm enjoying these pads now much better, and they are much better than the BrainWaivz alternatives that are just too thick so they create more distance between the ears and the drivers hence losing their bass impact. These pads are for people who likes the bass response of this HP, but wanted better comfort, however as I've said you might need to EQ the region of 125hz to remove that "congestion" one might perceive and also add some boost below 60hz. YMMV.