Pros: Clarity, detail, forward mids, build quality, mono switch (great for using with mixers)
Cons: Highs are a little thin/hollow , stock pads are bad
Bass: Definitely not an "extreme bass" headphone like the box says. There is a very slight bass tilt. Very tight bass. Very well extended with m50 pads.
Mids: Pretty forward overall. Amazing with vocals. Amazingly smooth mids.
Highs: Has a little bit of treble roll off. Sounds a little thin
The overall clarity and detail is great.
These really work better with an amp. Overall clarity, soundstage, and neutrality improves.
Effects of Ath m50 pad:
Tames mids a little (still has forward mids)
Adds a little more depth and a lot of width to soundstage (still nowhere near open headphones of course )