I agree about the ear pads. Although, I am sure someone will come up with a solution.
As for the X1's detail, it's very impressive. I am still amazed with the amount of detail the X1's retrieve without a hint of harshness or sibilance. The treble is smooth, but I don't detect any roll-off. It just seems like the perfect balance to me. You get all of the detail you want, and none of the negative aspects like treble peaks or sibilance.
Also, I forgot to include this in my review but I did replace the stock X1 cable with a MediaBridge cable. I don't know if that makes a difference but I already had the cable when I bought the X1's so I thought, "why not"?