Hm...the question now is...is the audio circuitry any good?
Because if not, then I think Samsung global models (actually I think US is using Wolfson chip now too right now because they abandoned the Snapdragon 810), Apple, or Sony for good built in audio circuitry. I'd like to not have to get another brick to slap onto the back of my phone.
At $250 and below for the models I'm not very optimistic (they're probably using whatever Qualcomm included). Then again, Xiaomi touts the use of better audio circuitry in their products. Only issue is the QC. MIUI is actually pretty nice. Weekly updates...(O_O).
I'm using a MI2S and MIUI is the worse ROM I've ever used in my life......
Mainly due to all the Chinese/China localization features. (e.g. default search engine is baidu)
Even Samsung's ROM is a bit easier to use IMO.
I'm now using CM11 on my MI2S and Nvidia's ROM on my SHIELD tab.