The i4 was driven by a Chord Mojo which I happen to own and love for the transparent & musical character combined with the ability to drive particularly well iems and headphones alike. Knowing the Mojo by heart it was easy to trace down the i4, a most definitely musical in ear headphone with smooth top end, sensual mids and excellent bass extension. Music was meaty but maintained perfect separation among instruments while providing a holographic soundstage.
Overall quite impressed though there is one small catch, Audeze scaled down the sound of the LCD-4 to a few grams of portable joy but failed to do so with the price, at $2495 the i4 wont be accessible to many.
On another note, I gave a quick listen to the Audeze LCD-Pro cans and they are very, very, very promising. Price is reasonable (if kept at under $1300 as discussed during the show), sound is somewhat flatter than say LCD-2 and closer to LCD-X with weight being a couple of hundred grams less! This could be the LCD many are waiting for (including me).