I have a Sony
NW-A306 music player that I bought a couple years ago to replace my iPod.
It's ok.
Does more or less what it's supposed to do.
Accepts a 1tb micro SD card so you can put lots of uncompressed music on it (I think it supports 2tb)
Android based,
Supports bluetooth and wifi plus standard 3.5mm audio and USB-c jacks.
Comes with free Music Center software to manage your files on your PC. (I use JRiver instead)
Claims to include dedicated DAC chips instead of the standard DAC you find in most androids
Quite small compared to most other music players
Sound quality? I mainly use it in the car or with a small travel rig, so the weak link is not the player. I rarely use it with headphones, but it seems to work adequately well when I've tried. If I was still working as an audio engineer I'd pony up for a device with balanced outputs, but I don't need that feature now.
Battery life? Not an issue for me since I (mostly) only use it where there's a plug to keep it charged.
If I had it to do over again, I'd just get a cheap android phone, add an SD card, and install some free software (e.g.
musicolet). Which is exactly what I did so I have a backup - a 2022 motorola moto-g does everything the Sony does for $45 instead of $400 and the UI is better.
But I'm sticking with the Sony since it's not worth changing the setup that's working - I cheaped out on the SD card for the backup player and only got a 500G instead of a 1tb and I don't feel like it's worth my time to move the SD card.