The best headphones I have ever owned by far, I would never have ever considered the prospect that one day you may be able to mix a complex piece of music down with headphones! However sadly I cannot trust them 100%, I still have to switch to my main monitoring system, which does show the headphones miss a few tricks in the LF range. Mids and tops are almost perfection. All in all very pleased. Would love to hear the LCD'3s. 
 
NB. A good quality headphone amp is a must for these baby's regardless of the company's claims.