I have the original V-Moda Crossfade LP Gunmetal(not the LP2) and can add a hint to those saying mids and treble are muffled.It depends on source. When connected to my unamped nanos (4th and 5th gen) they sound congested and require more than half of the volume mids and highs sound distant and the lack of sparkle does not allow instrument positioning although the soundstage is almost 3d all of which made me want to flame them. but I tried them on a sony mini system and the sound changed totally for the better.
Every part of the audible signature sounded SO MUCH BETTER than the ipods (consider I use mostly 320K mp3's ) that I blamed them for poor output ( I have many 32 ohms cans that required more than a notch up in the clickwheel). So I decided to try an inexpensive amp to drive this babies correctly and got a fioo E6 to hook it up to the ipods and the crossfades and I selected the mid boost EQ of the fioo (the blue colored one) and the subwoofer-like sound was subdued for the fist time. I can hear more clarity from the V-Modas but not neccesary greater detail. They sound much better now and I can save battery from both ipods using the fiio for the ipods won't requiere much volume to drive them. In fact they require less. I love the comfort they provide and the build quality, cables and storage box.
That said I know there are much better performers out there for I recently tested the Beyerdynamic DT 770 and they sound more true to timbre and less harsh in the treble section but I still think the Crossfades are a bit underrated and poorly tested and modded.