Bridged Ethernet Any Pro's or all Cons?

I think it is.

As far as I know, some people from A novel way to massively improve the SQ of computer audio streaming - Music Servers - Audiophile Style advocate a bridged topology to improve SQ. I have not looked into what theories, if any, those guys came up with to explain the SQ improvement though.

Another recent thread about a bridged setup is here:

The trick to getting it work is that there must not be multiple subnets, and multicast packets need to be allowed to pass through the bridge.