Been using a vault 2 for near 2 years.
Few more things to add to the already fine points and comments made.
It really is near enough an all in one digital source. You can stream any number of internet radio stations, Tidal, Quboz, Deezer etc.
You can access your NAS at any time as long as you set it up to point in the right direction, all info easily found on Google.
You can attach a USB drive that contains music and access all of that too.
You can stream another device to it via Bluetooth so having that library of music too.
And of course the CDs you ripped to its own internal drive.
Backup is as simple as plugging in a compatible 2tb USB drive and selecting full file backup in the settings. You can continue playing music while it is doing this.
Continuous updates to both the player and the Bluos app over the net all automatic.
Good customer support, usually reply to emails in under 12 hours.
It’s internal DAC is ok but you can do much better with an external one but has to support full MQA unfolding if you intend to stream Tidal MQA( you have to!). I use a Mytek Brooklyn DAC and the SQ floors me at times!
The Bluos app is available on both Apple and Android products and works flawlessly imho.
You really do need to spend 3 times as much to better it imho.
Oh, yes i do like it a lot.... Lol.