One of the best in its price range!

I own it for more than 10 months.
The first helmet of the famous brand KEF, brushed aluminum hoop (sustainability & lightness to the appointment)
Very comfortable because it does not compress the head and unlike some "review" of specialized site, it is suitable for every head (I am very tall).
Atria of the cushions are very comfortable because they take the form of ears in no time without deform over time.
The only downside to this convenience is that it will fall in the event of sudden movement.
And yet it is quite concerning, I use it to do cardio in the gym and it never falls.

It requires 50-100 hours honing to benefit from all its sound quality.

It is easily "driven" (energized) by android phones / ipod and other players of the genre.

Personally, I use it with a FiiO X5 (line out) + Amp Portable JDS Labs C5.

Once "honing"
(I do not make any particular song comparison function, which for me was not truly representative as we can not hear itself, then I will stay in the general level of genres)

Beeper is a HiFi headphones (its quite hot) with a small tendency to lanalytique (tendency to go to a neutral sound).
The sound is dynamic, much more than other headsets in the same price range.
His "soundstage" is pretty impressive compared to these other helmets (I tried the Sony / B & W / Sennheiser / Marshal / AKG closed, those at 250 and 300)
He did nothing wrong and even comes encroach on the territory of open helmets.

A small defect and has not very pronounced low, although they are well represented and accurate, the fact remains that it lacks some volume. (Corrected by the amp JDS C5 and "bass boost" in my config)

It restores fine voices, women more.
He will be greatly appreciated for genres Classical / Jazz / Rock / Alternative / Metal.

Its slight lack of bass is more felt on electronic music, even if their precision will make listening convenience. (I listen to hardcore / industrial / electro)

In short if you are not a fan of the Beats, you will no doubt enjoy this helmet.

Without lapping, his review may seem a little neutral during initial use, but which will quickly warm up after lapping.

I strongly advise flac files (or other lossless format) for improved reproduction pieces, use with mp3, it's a little lard pig given IMHO.

Since I went to look for other helmets audiophiles stores (I doubted a little with my purchase .. in fact), I am madly in love.
I tend to think that it gives equivalent or very close to the upper end to his.
In terms of cost / sound, it's a real deal.

The best advice I can give is to go try it audiophile store before you buy with your audio source to compare directly to your favorite tracks.