MartinLogan Mikros 90 Refrence On-Ear Headphones, Black

Pros: Flat response beyond human hearing range.
Exceptionally high quality construction.
Reasonable job of blocking ambient sounds.
Deep bass extension on my ears.
Soundstage is wide and deep.
Midrange, especially male vocals, is excellent.

Cons: May clamp some people's heads too tight.

Overall Review: These compare very well with my AKG K701s. That is my reference for perfection.
I can understand why some people rip them so hard because they are on-ear, not over-the-ear or in-ear which are much easier to fit. The technique for fitting them properly is to start low and back and adjust up first, so that the bottom of the earpad is just barely above the earlobe - then forward until the bass extension is at its peak. At this point, treble and midrange will be natural - not sibilant, and not in-your-face. Strictly opinion here, but many people seem to believe the opposite - that the more in-your-face the music is, the better the sound, or that the more the treble is turned up, the better the sound. But in reality, even the tiniest bit of sibilance IS AUDIBLE DISTORTION. Any headset that produces audible distortion is off my list automatically, and that means the list is pretty short. Nothing from blose or drdre make the list, but these do, along with the aforementioned K701s and Sony MDR-7506s.

Pros: It's really clear. I can hear things I never heard before in my music.

Cons: I use it both to listen to music, video chat, and game. It's microphone is really bad (or perhaps my 3.5mm microphone port is busted?). The microphone has a lot of extra shhhhh noise and is really soft. It's clamping force on my head is way to strong. I have a slim head and it is giving me a skull fracture.

Overall Review: None