I've used both the ZS1 and ZS2, and I can never get them to fit right in my ear due to the shape of the housing. The ATE/ATR works just fine though. Is there a way to wear it I'm missing out on?

Will the KZ ATRs fit Comply Foam tips, Spinfits or JVC Spiral Dots? I'm thinking of grabbing a pair to enhance the comfort of my ATRs, as the provided silicone tips don't really cut it.

Does it make the ZS3 a bad choice for a user who will only listen to 320kbps music on their smartphone?

I have heard that the ZS3s are mediocre on bad quality audio files, but is it alright for the average smartphone music listener? I am choosing between the ATR, ATE, ATE-S and ZS3 for a friend who listens to pop/electronic music and likes the bass, but prefers balanced mids and highs as well...