Picked these up refurb'd on another site for 20 bucks.  Having owned both the Motorola S9 and S10, I wasn't expecting much.  The S10 was a downgrade in sound quality from the older S9's (which had WOW EQ...the S10s had no EQ settings at all), so why would these be any better?  Man was I wrong.  I would imagine much of this is owed to the aptX codec that is supported by my Note 4 and the fact that they have brought back built-in EQ settings.  With my S10s I needed to use a phone EQ to make them sound even mediocre.  Not these.  I turned my EQ off and use the built-in and they sound amazing.