Extremely Buggy
Ive been using this app for the past several months, and Ive never been completely happy with it. When it works properly Z-Subsonic is pretty nice. But there are numerous crash bugs, and Ive had my settings get completely wiped on more than one occasion.
Z-Subsonics standout features are its ability to cache songs locally, and to pre-cache the next track while the current one is still playing. Neither of these features, however, work as well as they should. Pre-caching has an issue which causes tracks to get cut short. Theres a workaround for the problem, but it requires you to dig around the guts of the Subsonic server, and introduces some problems of its own. The local caching works, but if you encounter the truncation problem, its impossible to clear out the incorrectly cached track without wiping out every other song youve cached. Furthermore, its extremely difficult to get to the tracks offline (actually its impossible if you searched for the tracks), which makes it useless for plane trips and the like.
Overall this app simply has too many issues to be considered usable. I suggest you avoid it, or at least wait until it gets better.
Doomstalk about
Z-Subsonic