Another dongle to loose. Tons of headphones obsoleted. Can't charge while listening. Laggy audio. more batteries in the world. They're ok with a bulge for the camera but not headphones? I work in a lab and a phone with headphones is standard equipment on the commute and work (for at least part of the day).
I would seriously move off iOS if I was making music with it. If only iOS devices were made by other manufacturers... (I know I know....)
on the plus side minimum memory had been bumped.