I am not quite sure but I think I spotted pieces of Qt in the Spotify client. That would explain a lot of its somewhat odd behavior on OSX (wrong focus states o

I am not quite sure but I think I spotted pieces of Qt in the Spotify client. That would explain a lot of its somewhat odd behavior on OSX (wrong focus states on some buttons, nothing serious) and its very consistent cross-platform looks. In Germany, its only competitor uses an AIR app. Since Spotify is not available in Germany and thus a slight pain to use, I would really like to use an alternative. But AIR vs. Qt... the AIR app does not work on case sensitive file systems (solvable), it does not recognize the Mac media keys, it is sluggish and playback is nowhere near instantaneous. And you have to install AIR and suffer through regular AIR updates and the like. Oh, and audio quality is noticeably worse.