For those who are having problems with no audio output, go to File -> Preferences -> Audio and change the output device to the correct destination. For me it defaulted to AirPlay for some reason.
Pros:
This app is extremely feature rich for being free. Pitch matching, measure sync, and so much information output that Im actually a wee bit overloaded. It also runs really smooth. Im impressed that it correctly parses the iTunes XML file to instantly show my song library, unlike some other apps which insist on scanning the file structure. Support for different bindings on different keyboards is awesome.
Cons:
Preferences is on the File menu instead of the Application menu, making it easy to overlook. This makes for a confusing first use, since it doesnt default to the built in audio out and its not clear how to fix that. Interface is very daunting and not newbie friendly; if you dont know how to DJ already then the purpose of most of the controls will completely illude you. Could REALLY benefit from a tutorial. The chosen star graphics for the itunes playlists are too bright and lack contrast, making them hard to read at a glance. Could also benefit by some different fonts, the text in the collection pane is way too large.