I love the feel and look of these (perforated leather) pads. While I can't definitely say the tone is vastly changed from the original pads, they are vastly more comfortable. The materials feel much more high quality, and they break in nicely.
The pad swap process for the HE4xx, however, is a NIGHTMARE. Dear God. Hifiman's fault, not Dekoni's.
KujoAlso, Dekoni's video guide is terrible. As I recall it tells you to hook the pads into the cups in a clockwise or counterclockwise fashion. That's crazy. It was much easier to get one hook in, then do the opposite hook, then repeat with the final two hooks.