I will admit I did not notice a difference when changing out the pads. The sound was very enjoyable. I did find that the head band still pressed down on my head similar to the Shures. This for me means I could not enjoy them for more than about half an hour.
I found the experience very positive
I am waiting for the PM-3s to come out, as interestingly they were comfortable and being closed will suit my listening environment. I heard them at TAVES.