Well, after demoing the HD1 all weekend, I have come away impressed. First thing, I actually prefer wired to wireless, although both sound great. I actually did a comparison on Rtings between the wired momentum vs. wireless to see if it was similar to what I was hearing, and it was. When wired and powered down, there's slightly more bass push, especially mid bass, the mids are more forward and cleaner overall, and the treble is slightly cleaner although slightly pulled back overall when compared to wireless/powered on. The sound overall is cleaner to me. I hear details a little clearer. Powered on/Wireless is better balanced, and I can see why it's more appealing to some. It's more neutral and has a little more treble push. My only issue with wireless is that there's this slight harshness in the upper mids that becomes really fatiguing if I crank the volume too high. Both sound outstanding and have that magical mid forward sound I've always loved about Sennheiser. Sounds just like I remember from owning the Momentum 2.0 Wired a while back. Definitely sounds better than the B&W PX to my ears. Both wired and wireless. It's jumped up my rankings as one of the best sounding bluetooth wireless headphones. I'm having a tough time deciding which I prefer, the Crossfade II Wireless, Sony H.ear On 2, Beats Studio 3, and these. All sound different and have different advantages. H.ear On 2 = Warm, Balanced, and Musical. Crossfade II = Spacious, Detailed, and Exciting. Studio 3 = Energetic, Emotional, and Exciting. HD1 Wireless = Musical, Powerful, and Smooth. The best way I can describe them in short LOL. I'm going to give up one, jus haven't decided yet.