I also had owned an XDA-1 and had return it dissatisfied. The volume control was an issue but apparently has been addressed since but sound quality isn't anything to write about.
Just as Ts0711 wrote, the bass is bloated and doesn't show much pitch or definition. The midbass and midrange dynamics while is an improvement over the Mac Mini, falls quite short of my Marantz SA-11S1. The treble range recessed and doesn't take any air or space of any kind.
Is it worth its dollar? Well, yes. It does improve the sound compared to my Mac Mini analog. It can not on the other hand be considered a high end killer. I didn't keep it as I knew it wouldn't meet my expectations in the long term.
Just as Ts0711 wrote, the bass is bloated and doesn't show much pitch or definition. The midbass and midrange dynamics while is an improvement over the Mac Mini, falls quite short of my Marantz SA-11S1. The treble range recessed and doesn't take any air or space of any kind.
Is it worth its dollar? Well, yes. It does improve the sound compared to my Mac Mini analog. It can not on the other hand be considered a high end killer. I didn't keep it as I knew it wouldn't meet my expectations in the long term.