I have a Sony Walkman NW-S544. It's been passed down to me by my mother and It's been smooth sailing. I love the process it takes to get new music on it. Though, I do procrastinate when I want to put new music on it haha. It's pretty simple to work and straightforward. There's no application required in order to move the music to the MP3, just somewhere to plug it into and transfer from that other device. It's not the most "aesthetic" option but I'm only using it because Spotify sucks and I want to be able to listen to my music anywhere without issue.