Very happy with my GR07 straight on to my iPhone4, except when playing dubstep in a noisy environment where the bass impact and rumble needs a little boost (either through EQu or the E11 that I just got).
With the E11, my first impression was that the sounds seemed to be even more separated. However, I haven't bothered to do an actual A-B comparison with amped and unamped yet. I've just been thoroughly enjoying the music for now! 

























