I still love my Amperiors. They're breaking in beautifully. Out of curiosity, I purchased the Ultrasone Edition 8 this week to audition them against the Amperiors. They're quite a different sound signature from the Amperiors and I'm having a hard time deciding between them. I listen to 80% classical music and the ED8 is more detailed and has a larger soundstage than the Amperiors, but the base is almost too controlled, or lacking, for my tastes which makes the overall presentation sound too thin on many classical pieces. Not so with the Amperiors, which sound much more full-bodied and punchy with all types of music.There's an immediate wow-factor when I start listening to the Amperiors.
In contrast, I am underwhelmed every time I start listening to the ED8, but this changes after my brain has had a few minutes to adjust to their more neutral sound signature, and then the ED8 starts to reveal clarity, detail and a purity of sound I've never heard before on any headphones, though the base still remains lacking to some degree.
I am auditioning both the ED8 and Amperiors straight out of my iPad 3 and iPhone without an amp since this is the intended purpose for whichever of these cans I decide to keep. They're intended for travel, unamped. I have my home listening covered with my HD650s, Lavry DA11 DAC and DNA Sonnet. For reference, all my music is in Apple lossless.