I agree with both Byron and Larry above. For $450 (the price of the Bridge + ZP90), you get an incredible device and experience -- one which really makes music widely available in new, often unexpected ways. It's really great.
And I'll heretically suggest that the sound you end up getting from this-- even with fresh lossless files, doing everything right -- roughly approximates that of a $500 CDP.
I've got about $2k in 'improvements' to the basics - Cullen mod, a Monarchy DIP and NM24 Dac, good cabling and power, and again, I'd say that cost/value/performance is about equal to $2500 worth of 'real' CDP/DAC gear. Which is to say, it sounds just fantastic.
IMO you can definitely get there with Sonos...but it's arguably not its highest and best use. YMMV.
I do wish Sonos would do a good player unit. Their interface is really stellar, especially in terms of engaging spouses, the rest of the family, and guests.
To be able - while seated at dinner -- to call up a Lou Reed Pandora Radio station because your guests mentioned liking that sound, or to shuffle play through your own Reed collection...without them even knowing you pushed any buttons? How is that not worth $450?