The menu is a little strange but it's learnable. I use it mostly for playing audiobooks which need to be loaded into the music folder. The ruizu mounts in ubuntu and mint linux for file transfers - perfectly.

Battery life is good - i keep it plugged in for charging when not in use. The sound is crisp, clear and strong and the battery holds for at least 5-6 gym visits.

General operation is acceptable, but if your goal is use this player with a large music library on the expansion card, there are significant drawbacks. The screen scratches very easily. And the screen is so small i have trouble reading it.

Bluetooth is not automatically on. But as soon as it's disconnected, it's dead. The display truncates album and song titles and will not scroll left/right to expose the entire title.

It is like the manufacturer forgot that we landed on the moon more than a half-century ago. We need to read the review because all of the garbage devices is around us. That makes it a really small $50 piece of trash.