Have the set (including one for the Hi Fi). Once you buy one, you’ll get more. They work beautifully together, sound reasonable and give a good overall user experience. Play 5 has AUX input, and I used it for TV output in our lounge, but Mrs TiRed never really adjusted to switching inputs. Play 3 sounds almost as good and fills a room. Two Play 1’s in stereo are also an option. If you don’t need AUX input, I’d buy a Play 3. One of our Play 1’s has proven a popular university purchase when Teen1 is away!
They now use your home WiFi by default. I preferred the previous Sonus networking.
That said… “Alexa, play Radio 4” is rather a nice saying in our kitchen at the moment thanks to Amazon Prime Day. Too bad the sound is rubbish. Needs “Alexa, play Radio 4 on the Dining Room Sonos 3”. I hope that’s planned 😉