Ill disagree with most of the posts above, two Sono's One's paired into stereo are very pleasing SQ wise. The Sonos App has a tuning feature and once i had done that the sound stage was noticeably wider than the room and the tonality was excellent.
They certainly aren't the last word in audiophile sound quality but for causal listening they are excellent.
Price comparatively you could probably beat them with an amp and bookshelf system but for ease of installation, neatness, additional features like the multi room, Airplay2 etc they really do excel.
plus I got two second hand for £250 so deals can be had.