I've never used it, because I don't need it. I do use their Reflector software that lets you to AirPlay to your own computer, and I like it. The Slingshot software takes it a step further by allowing you to use the computer to broadcast what you AirPlay to the computer to other users of their software.
Good luck.
Edit: Not sure about the audio. Check their site to be sure, ask if it isn't' clear.