I am using a FiiO X1 still and love it. FiiOs have great DACs although their software is wanting at times. My biggest issues with my X1 are: 1) Music Discovery

I am using a FiiO X1 still and love it. FiiOs have great DACs although their software is wanting at times. My biggest issues with my X1 are: 1) Music Discovery, as my local collection has gotten so large, I often find myself using Jellyfin or local desktop music players to discover, then listen to them on my FiiO 2) Limited Queuing ability. This isn't normally an issue for me, as I usually listen to complete albums all the way through, but if you want to quickly create playlists, the X1 is terrible for that. But, the sound is fantastic. Controls are simple. I don't get distracted and can just reliably listen to my music. Transfer/management is simple (I use rhythmbox with its usb device support). Battery life is great. Storage is expandable and supports a microSD card (I currently have a 256G, but will probably upgrade to a 512G soon). Supports ogg, flac, mp3, and other formats. Unfortunately it doesn't support opus, although I think newer models do. I haven't tried any of their newer models as mine is 8 years old and still works perfect.