So my galaxy is busted and waiting for a replacement. Using my backup AT&T ZTE phone, basically the lowest end smartphone you can buy, $49.99, and I used it a lot and the speaker's good and broken in.
Listening to Spotify in the tub with a finger over the speaker hole(you can really change the output and get a different sound), and the sound quality, for what the device is, is spectacular.
It's really impressive sounding actually.
I think HiFi will one day be dominated by small devices.