Just hooked one of these up yesterday. I unfortunately only have room for one system now so my speakers have to do double duty.
This unit allows me to switch between my surround sound receiver for movies and my tubes for music. You can hook two amps and up to seven pairs of speakers or vise-versa. The build quality is decent and I cannot here any degradation in sound. Only complaint I have is the lights on the front are way bright, but that is an easy enough fix. Just thought I would share.