I couldn't compare it to the Omen, but I heard the nanotecs in a Superfly this past Saturday and it was pretty stunning. It was fed by a cherry amp which is an 'unusual' pairing for a 101db speaker at 700wpc, but it was a great match.
The resulting sound was more transparent, refined and dynamic then I recalled my Superflys being. The stage was also far bigger than I remembered. I got a taste of what the Def 4s could do at that same meet, but truthfully, upstairs the nano'ed Souls were more impressive for the coin.
On a side note, I'm returning to team zu! Tomorrow morning I'm picking up a Piano Black pair of Definition 2s which I plan to install nanotec drivers in. Speaking to Sean it appears they are far easier to place then the Soul Superflys and can get very close to my front wall which is a HUGE plus for me. Can't wait!!