Although I am generally very pleased with iTunes, I suspect I am not the only one excited by the potential of a Mozilla-based Songbird as an open source, addon enabled music player alternative. Thus far I have found it too clunky and unresponsive to use as a replacement, but I eagerly await its development. I have also found the Songbird team to be very responsive to feedback and queries, which is a good sign. Has anyone here had much experience with it? If so, what do you consider to be its virtues and downsides?