Digitalbath3737, I share your same feelings.
I tried the Shure SE310, and SE530, and thought they both really sucked, bad (Please read: Not my cup of tea). Great isolation which is nice on airplanes, but they just sound so awful...
Yea, I would reach for my PX100 over the SE530, since the PX100 are more fun; fun being what I want in a portable headphone/earphone.
It's sad when a 30$ headphone is more fun than a 450$ headphone.
Anyways, needless to say, the PX100 are still my portable headphones, and I will use the HD25-1 II for times when I need portability and isolation.
Saved myself a lot of money to boot, and have the sound sig that I'm looking for.
^_^