Pros: Flat frequency respose, not agressive, detailed and natural sounding.
Cons: Not enough deep bass and air. Fancy package not useful.
I bought the S version that has standard 3.5mm TRS unbalanced plug. I didn't want to use the balanced-to-unbalanced adaptor that comes with the non-S version because my players would not have balanced output I thought it was a problem less and avoids more connectors deteriorating the signal path.
First impression when receiving the box is that it is fancy looking with leather and mirror, but on second thought not very practical. Stored the box and will never look at it again, so what for? I would rather save ~$50 off the price. Comes with various tips and I used the one that came pre-installed (small bi-flange), which suits me fine. Also the tips come in the box within holes in a hard foam and is hard to take them off these holes.
Confort is excellent since it is so small. Isolation is also quite good. Build quality of the cable and the phones is very good, although I am a little worried with the connection of the cable to the phone since there have been complaints that it is very fragile. I am definitively going to take good care and always remove by pulling the phone out of the ear instead of pulling from the cable (the manual says that too).
Sound quality is very good. Initial impression of the signature is the same as long term: the tonality is even and flat, although there is not much deep bass or airy highs. I feel a slow roll-off in the sub-bass, and a fast roll-off in the treble. I am not a "bass head" or used to "V curve sound" but still. This creates a more mid-bass to mid-highs extremely flat response which is somewhat more intimate to listen to. Definitively won't play well energic pop and electronic modern music. The resolution is very high, nice textures and details. The soundstage is very well presented and wide. I found low sibilance in the highs even in recordings that I know they are a little on the hot side, which is a consequence of the somewhat rolled-off highs.
So overall very good and I recommend it!