I also found that it does not work well if audio is playing and charging at the same time

I've had other players that wake from any button press, which I prefer.- When a song is playing, you can press-and-hold the forward button to launch a popup menu with selections such as play mode, gain, delete, add-to-playlist, and add-to-favorite

There was a noticeable improvement in sound quality over my iPod Nano's playing conventional mp3 and m4a files.

I love playing FLAC music and being able to use an SD card with enough space to hold my library.