I just bought sonos and it is working absolutely fine on the sonos app without a bridge.
As far as the smart hings app is concerned, I am having the same exact problems that everyone else has mentioned. The music does not resume, the volume has issues during the announcements, some announcements cut off in the middle of their recording, and not one of my Sonos players is actually able to turn on or off via the ST app.
For whatever reason, I cannot even find my stations to play when a specific action happens. The app only wants me to choose a music track.
It is rather disheartening to see that people were having the same exact problems 1 year ago. Especially since the only reason I got this system was because it could connect to Sonos. In light of this, I am going to return all of my smart things products and just wait until they fix these issues before I repurchase anything that has to do with smart things. By the time any of these issues are fixed, smartthings will have come up with better products and what I am currently dealing with will be outdated.
Also, keep in mind that the smart home is still in its infancy stage. Apple is launching a new system as well as Google. There is still no clear front runner. I would rather return this dysfunctional app and buy something that both works and is going to be supported in the future. We don’t even know if smart things will be around five years from now. Some of the other home systems that were popular a few years ago are irrelevant today. And considering that the basic bugs have not even been addressed yet in a year I am skeptical that smart things will be the platform that dominates the smart home system. And if for whatever reason it is, by the time this is widely acknowledged, their products should work as promised.