I have used them, but I wish we had more control, like with treble and bass. I like that with the Android music players. You can make your flat earphones sound amazing with the PowerAmp EQ.
i use "electronic" setting when i use earphones. when i connect it to car i leave flat and equalize from car radio to "bass +2, mid -1, treble +3", because usually its the best setting for EDM.