Audio output is done the wrong way.
The iTunes visualiser does not respond to the audio, which means that this component is outputting directly to the speakers rather than routing through QuickTime or whatever it is that a proper codec normally does. I haven't verified the following, but I would imagine that this also means that you can't use the components to burn CDs and that Ogg Vorbis files will not play over AirTunes (as was the case with the old qtcomponents.sf.net version). While it is not severe enough to prevent me from using the component, it is a big aesthetic problem for me. This should be done the right way.