I have two iPad nanos (one for music and one for learning Chinese), although I really use them anymore with headphones, you are about to find out why...

~Using My Apple Earphones~ 
I still keep a nano in my handbag so I can relax to Beethoven or whatever on the tube however I avoid using them unless I have a real urge for music.  I can't say I am an earphone fan anyway, having earphones in makes me feel "boxed in" and I do feel that when I am walking about I need my hearing senses more for survival than for listening to music.  However sitting on the tube would be a prefect scenario for "shutting off", only I find these headphones actually hurt the insides of my ears!

The earplug part is quite large and round and flat at the point where it sits in the ear and I find that first of all it doesn't stay in awfully well unless I twist it forward against the front of my ear and then it causes me pain.  At first, even if I only lightly put the earplug part into my ear then it just feels a little uncomfortable but then after 10 mins or so it really starts to hurt my ear like it is getting bruised and warm and then its starts to give me a short of headache pain in my ear.

~Design~
The plug part of the headphones is somewhat flawed, well either that or they were made for giant earholes, but, as far as earphones go I think they look quite good.  As far as I am aware these type of Apple earphones only come in white with light grey rubbery patches around the earpiece and the bottom of the earplug, where it meets the wire.  I suppose white is good because you can tell if they got dirty and they are of a material which is "wipe clean".

The microphone mesh on the part which goes into the ear is strong and can't easily be dented.  The mesh is much better than the foam sort, which must be higher unhygienic.  The wire is very soft and subtle which means it doesn't get kinked when wrapped up in my handbag and has aplastic button at the point where the wire splits into two which can be slid up and down which can shorten the two wires to the ears presumably so they the wire site tighter around the chin.  The plug which goes into the device is small and dinky, about 2cm long and thin so not bulky for packing in bags.  All in all the wire and plug are designed quite well.

~Sound~
I'm not an earphone "enthusiast" and these and the only earphones I have used in years so I don't have anything to compare the sound against, but to me the music that I play through them sounds good, with even layers between bass, alto, tenor and treble sounds.  One problem with listening to classical music through earphones on the train is that it has lots of dynamic variations, so often I can't here the quiet parts and then if I put the sound up get blasted out in the loud parts.

~Cost~
Mine came with the nanos, but I don't think they come cheap.  I've just looked on the Apple Store but I couldn't see type sold just as earphones.  Similar looking ones come in at least £20 - wow!

~Summary~
Aesthetically - quite pleasing
Sound - good
Earplug - bad!
Durability - good
Packability - very good

So either I have the strangest shape earholes ever or Apple got the design wrong or go by the moto "no pain no gain".  Either way this loses them 3 stars, they only get a 2 from me as I do like to listen to music in comfort!