I don't know if it's a flaw specific to my unit, but I think that they're very unconfortable. The cushion makes me feel pain in the ear skin, what doesn't happen with other in-ear phones such as Sony MDR-EX32LP which I also have, and it's not nearly as retractable as regular in-ear plugs that you buy at stores. I've modded an in-ear 3M plug into it so I can have more confort, but it's too much work, at it's also not reusable. What do you think about it?