You can read tons of reviews actually discussing the audio aspects of this set, I'll just stick to saying the lows are unforgivably clear and they have a great soundstage for IEM's.  They sound amazing!
 
Anyways, I mainly came to knock these down a peg - be sure these are for you before you buy!  I never realized how bad a high-end IEM could be for me personally.  I've loved my IEM's in the past, even enjoyed some cheap Senn's more than these.
 
 - Horrible microphonics!  Just breathing sends scratching sounds right into my ears!
 - Short cord, can't be wrapped behind ears. (Can't detach and replace either!)
 - Heavy inline cord connector, makes microphonics worse.  I can hear my resting heartbeat, never had this issue with prior IEM's!
 - They don't fit...HOW!?  It's a struggle to get them in my ears and all they do is constantly fall out!  Never had this issue before, even other Senn's weren't this level of bad!
 
I really don't understand, is everyone nearly deaf and blasting these into their ears while sitting still? (No offense; these are rated all so well by many with such excruciating flaws!)
These might be for you - they do sound amazing, but I just can't stand the flaws.