I haven't noticed any issues. Compared to my M7, the battery is fantastic. Almost as good as my Droid Maxx. I compared music to my iPod (same song, same ear buds) and the iPod was louder but had noticeable distortion. The M8 HK had a noticeably better dynamic range. All in all, I love mine. Until the next model comes out, then I'll be lusting after the new shiny thing. ????
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