I've had these for a several months now, I was amazed when I bought them and they continue to amaze me. I've had my share of Etymotics, Westones and Shures, over the years (and with flights and funds increasing) upgrading through their ranges. I've also been upgrading the sources; having rediscovered mobile music (from Walkman days) with an iPad mini, then various Nanos, then phones. I bought these last year and they made a massive step-change in what I thought was possible in every sonic aspect vs the previous portable gear I'd owned or heard...

The first bars of the 24bit version of Massive Attack's Unfinished Sympathy - I got my wallet out.  More detail, soundstage, bass, more finesse, more power and dynamics (I listen to the AK100 in isolation at around 47-50, currently listening to the AK120 at 39 - whether it's exactly the same scale, I don't know of course)  However, I don't need to strap it to the Vorzugge Pure to get the extra punch that combination offers.  The software has a grid interface which feels like progress, and it seems to be more responsive in use.  Retina doesn't apply...