Digital audio player. Bought 2016.
Main use - playback native DSD, of my recordings of vinyl LPs.
2020 - Sandisk 400 gb card. The player can now hold a file library of 100+ albums in the best DSD format. No problems.
2022 - my vinyl rips still often sound better than digital streaming - though the gap is decreasing.
The X3 has been very useful, easy to bring along to my cottage, on holidays, etc - presenting much of the sound I get in my main system.
Maybe due for an upgrade but I've not found a clear candidate yet.