I have a pair, and I think they are decent 'phones.
Regarding the "staying in your ears" problem, I thought it was just me who have odd shaped ears, but clearly not.
I have done a couple of simple mods to actually make these 'phones more wearable -- I even use these down the gym on the treadmill on occasions.
Firstly, stopping the cord bouncing around reduces the frequency of falling-ou-of-lugholes, so a couple of judiciously placed knots and a hands-free croc clip allow you to attach the cord to your shirt.
Secondly, I have removed the ball-esque earpieces -- they were good enough at blocking out the external sound but not too firmly fixed in my ears. So I cut up a pair of industrial ear-plugs, put a hole through the middle and put them on in place of the "balls". The benefit of this is that the plug is compressible so you can put it easily into your ear canal. Once in place, the foam gradually expands to fill the void. I find this stays in my ears much better, and with a industrial level of noise reduction!!!
Have a look at a couple of pics [copied from my
blog].
mal.