I have an RCA mp3 player (Not sure what model it is, will check), and a Sony something. I also used to have a working Element mp3 player.
The RCA pissed me off at first, because the fucking software that supposedly came with it didn't load upon USB uplink.
The latter one works fine.
The Element's solder for the headphone jack broke, disabling it, and when I went in to try and fix it, I didn't know how it opened up, so I accidentally broke the speaker cord too. Still have yet to fix it.
To be honest, as long as it plays music, I'm fine.