Used this for a couple months now.  I can say that the V10 is the best smartphone I have ever owned.  My wife has a iPhone 6S Plus.  Other than the amp, the 2 DACs being used in the V10 and iPhone are comparable.  When using the Snapdragon 808 DAC instead of the Sabre DAC the iPhone wins hands down.  Sounds recessed and hollow with the 808's audio implementation.  The Sabre DAC 9018C2M combined with the 9602C headphone amplifier tops the iPhone (using low impedance iems/headphones) albeit not by a whole bunch IMO, but this is head-fi so that's saying...