I've been using Alt.Binz for many months now, with great succes under Windows, Linux, ánd OS X, and I love every bit of it (especially search & unrar).
The only problem I'm experiencing is a bug(?) using Wine & OS X during search & downloads. When I do a query I have to cancel it, and do the query again or it won't work. Same goes for download queries (based on search), I have to click download twice for it to work.
Just a minor annoyance, but it would be cool if you could fix it. The only thing I'm not sure of if it's the internet connection itself (DNS reply?) or Alt.Binz. I can't find any logs containing information about the search queries so I'm not sure if I can assist in that.
The downloading itself works perfectly though...