Sonic Defender
Headphoneus Supremus
Having owned the XM3 since their release, yes even suffering the toupad issues in cold weather, I still think they sound fantastic and the bass quality can be improved greatly by equalizing the bass bloat down. I use the built in FIR eq in Onkyo HF Player and the XM3 responded fantastically and the sound really cleaned up. I imagine the XM4 would do the same. Based on what I am reading I am not sure there is a real case to move to the XM4 for me. My XM3 are pristine as I rarely get to use them so the hours are low and I have never worn them if I am perspiring so in effect I don't wear them in the warm weather keeping the pads perfect. I will say that for people who are less into the noise cancelling and want closer to a neutral sound while still being engaging you should if you can audition the KEF Space One Wireless. The KEF is why I may actually end up selling the XM3. The XM3 is richer and more fun sounding with a really nice big, round sound, but for me the KEF is more accurate and tuned more for critical listening. Sorry, XM4 thread I know.