I finished and installed mine and had a several hour listening session. The review can be found here: http://www.polkaudio.com/forums/show...mon-ground-amp post #14.
I am truly surprised (and delighted) by the improvement. I just don't understand exactly what's going on. The transformer used is an isolation transformer, so how does the SDA signal communicate between the speakers? Doesn't the transformer prevent that? My knowledge of EE is severely limited, like almost non-existant, so I'm having trouble understanding this