i was looking at getting play 1s .. would you recommend 3s ?
Can't say how a pair of 1s would work in a large space like a store or such, but they are fairly small speakers so their power would be limited. In my small livingroom, I have a Playbar, Sub and a pair of 1s as rear speakers, and running just the 1s as a stereo set without the other speakers is rather impressive. You're not going to get bass you feel in the chest (like you do with the Sub), but they're surprisingly good at what they do for being so small.
This is in a limited space though - at the end of the day, the 1 is just a single 3.5" woofer + tweeter. I would look at a set of 3s for a larger room, not just because the 3 can play louder (and with better bass response too), but because it'll produce more sound without having to push its drivers so hard, meaning it'll sound better.
Without a Sub in the loop, Sonos on-board EQ processing starts dialling back the bass at around 50% volume on the Play1 to not cause distortion. Now, this is pretty darned loud, so depending on what kind of business you're running, you may not want to turn it up this much anyway. Just giving you my own findings so you can make a more informed decision...
On the whole, I enjoy my Sonos gear quite a bit. I've had the system for almost a year now. I've expanded with a bathroom speaker (another 1, since it's moisture proof), and a 3 in my bedroom. They've performed quite flawlessly since, once I had a brief moment where sound became unsynched and stuttered, but it cleared itself up almost immediately, and there's A LOT of wifi networks all around me, and it still performs really well. It's fairly impressive on the whole IMO.
Plus, if you run Sonos speakers wirelessly, they'll act as an access point. Plug in an ethernet cable to the speaker and you get internet access to your laptop or whatever. It's pretty neat.