The Philips GoGear Aria's sound quality is excellent, with very nice sound reproduction across mids and highs there’s a good EQ selection-presets plus a customizable EQ
I had both Philips GoGear ViBE and Ariaz and what I can say about the audio quality is that there's no perceptive differences between these two at all - what changes the perceptive sound quality is that each bundles a different headphone. I didn't quite like the in-ear phones that bundles the Ariaz version - the mids and highs are not that good on this pair.
All in all, it's a good portable player for those who are looking for a glossy-big screen but maybe not meant for those who are mainly looking for audio quality only. I'll be looking to sell my Philips GoGear Ariaz as soon as possible and try for a SanDisk MP3 player instead.