So my BA200 has been sitting a little lonely on my nightstand for quite a while. This morning I decided to plug it in to my new iPhone 5S and I think they may have just gotten a new lease on life. I thought they layered very well before, but ABing with my 4S, they almost sound flat in comparison. While through the 4S, the BA200 does sound more... romantic, through the 5S, it's very technically sound, showing off the new audio chain's better separation, layering, dynamics, and clarity.
Very good stuff. Highly recommended pairing for anyone that thinks the BA200 sounds a bit soft and lacking edge with their current pairing.