I have my transporter wired to the computer that serves up the music, but I use the transporter wireless as the bridge to my network. It turns out that the transporter has a much better connection to the wireless network than my home theater computer does, even with an external antenna located next to the transporter.....I'm not sure why.
I do get better and more consistent sound with the wired connection, but than when I use the server built into my NAS (where I back up my music). I assumed that the wired connection was simply more robust and has fewer micro dropouts. Certainly, when using wireless, I get occassional noticeable sound dropouts. This never happens with the wired ethernet connection.