The two bits that Sooloos has fundamentally changed for me in my music listening, having been a Squeezebox then Sonos user in the past, is:
1. Meridian integration. Im a lazy git sometimes and getting up off the sofa to juggle a couple of remotes to turn on hifi, select appropriate volume etc often prevented me from sneaking in a quickie (listen) when the mood took me. Oddly, I don't turn off the system as I cannot be bothered to fetch the MSR to press the off button

2. Swim. Unlike random play, I think this Sooloos function does really well to supply ever changing music but to your taste and mood. I remember when I first used LastFM, spending a good few hours just going through track after track of (mostly) music that fitted the our taste at that moment in time.