Well I also have a Samsung Jet but have found it to be quite a respectable mp3 player.
It must be my age or the type music I listen to, but in direct A/B comparison with my HiFiMan 801 just now, I found that the Samsung sounded quite similar and was not at all embarrassed by the mighty 801.
I was using a pair of Sennheiser HD 650 phones with their foam inserts removed and a short version of the standard lead to listen to acoustic jazz recorded at a live performance by my Sony D50 (piano, bass and drums sort of thing). Oh, and also some studio recorded jazz ripped from a CD. The phone was playing mp3s at 320kb/s and the 801 was playing FLAC.
Sure the HiFiMan sounded slightly better perhaps in every way - if one concentrated very carefully to what one was listening to. But by the time I had unplugged the phones from the Samsung and plugged them into the HiFiMan the SQ seemed to be virtually the same, or at least good enough for some semi-serious listening.
The Jet has a 3.5mm phone socket which is very handy, and will just about drive the (300 Ohm) 650’s but not to ear shattering levels, louder with (35 Ohm) Grado Sr125s and loudest with the supplied (average) ear buds.
So people’s mileage obviously varies, and perhaps one wouldn’t want to use a mobile phone as a serious music source, but I have heard a lot worse than the Samsung Jet.
It also has quite a good camera on it but I am not convinced by all the other bells and whistles…