I actually like the Sonos interface having used the system from the start. Currently have a pretty extensive system (mostly older stuff) but am very disappointed to see how mediocre this new amp measured. As we've seen in countless reviews here - it's not costly to get state of the art measurements. Even harder to understand or forgive given that Sonos has more resources than most and they come up with maybe 1 new product every 2-3 years or so.