only now do I know wtf op was talking about.. some tips:

a) spell it right.. "Shure"
b) don't use incredibly obscure (read: you just made it up) and/or off-topic acronyms.

I agree with what LordFoo said and I add:

a) I find them more comfortable than regular earbuds, BUT they are still fatiguing for long listening periods.
b) fairly lacking in bass.. flat frequency response is great if you're mixing The Next Hit Record. However just for listening back? Give me exaggerated EQ and I'm happy. They're do sound *flat*.
c) the loss of ambient hearing is GREAT in some situations (bus/airplane/library or office where people won't stfu/etc), but terrible for others (eg. riding)
d) that same sound isolation results in certain sounds being really amplified.. you get that 'fingers in your ears hearing' thing happening where your breathing sounds extremely loud, ditto for chewing. Also if the cable is bouncing around you wind up hearing that too.

All that being said, they're still pretty great compact headphones. If the point wasn't to have something you can just throw in a pocket/bag I'd probably go with some over-the-ear 'phones though.

btw. I have the E2c's