Is their any performance advantage

I have windows Vista media center pc 500 gig hard drive and a terabit external drive.I was thinking of getting a Media Center Extender. I can digitally transmit audio and video so I can listen and view my album covers in any room in the house. Is their any performance advantage for audio using a Logitech SqueezeBox Duet (since the duet doesn’t do video) Is anybody using this set up now and getting better than average sound . IPOD quality not acceptable. The extender is approximately $100 less than Duet .Plus I can access pictures, video’s ,movies and tv ect.
if you are not going to use an external dac and a jitter reduction device, you will not be happy using this kind of setup.