Pros: liquid silky sound
Cons: generally unbalanced sound presentation
These are way overhyped, the bass is lacking, the midrange is slightly off, and the treble range is downright pathetic like a drunken sailor, simple as that.
I couldn't believe how bad they are after all the hype, in terms of overall presentation they are unbalanced, and well, really quite inaccurate; i must admit that i even amped them with a FiiO E12, but i can't see how that would improve things anyway, since the 840 characteristics are already shonky; there's no way these would be any good for monitoring with, and even for portable use the only good thing about them is the looks, since the bass is severely lacking, the midrange is not authentic, and the treble range sounds quirky, also the sound stage is all over the shop ...and there you have it, I lie not!
Maybe i would concede that they do have a smooth silky tone to them, but you better ask yourself, how does that make up for general overall skewed presentation.
These others in here giving them a good review are either dreamers or need to get new ears.