I received a pair of the HM5 pads yesterday and installed them on my HE-500.
Couldn't persuade myself to spend $100.00 for the Lawton pads
I sure didn't think they would fit on the Hifiman ring at first (pad diameter seemed too small) but I finally did manage to get them on with a little persistence and gentle stretching.
Once on the ring they went on the phones pretty easily and fit well in the end.
They do improve comfort for me. I did not notice any significant change in the sound.
Edited by wlvca - 6/13/12 at 3:28pm