Yes, one of my clients does.
Fidelity is actually pretty impressive for what they are. They aren't hi-fi, but for wireless mid-fi, they aren't bad. I would personally never use them as a primary sound system in an area I cared about the audio quality, now for auxiliary or remote/satellite speakers for ambiance, they would be fine. The Play:ONE speaker is probably the most impressive of the bunch when you look at the costs - for what it does and how it sounds for $200 is astounding. Unless they have added it recently, I do not think they make a weatherproof speaker - which is a bummer, because I see outdoors as a good use for them.
They are a little buggy at times. They can sometimes get confused if you are using the wi-fi repeaters or multiple access points, they'll just fall off the network and have to be re-added through the software. They can also get nutty if you have too many people with the control software on their phones, tablets, notebooks etc and they go on and off network while linked to the sonos base.
For most home users, a lot of these bugs will never come to light.
If you just want to play streamed music (pandora etc), then the basic base is fine, if you want to tie it in to your other audio equipment, you will need one of the more expensive bases.