I got a Gear S2 a few months ago as a promo when I upgraded my phone, and I've been pretty happy with it. However, the only streaming music service that actually seems to work with the tizen device is Milk Music. Pandora (which I've been using for years, and continue to pay for on an off) doesn't have an app for the Gear. I can't seem to find a working standalone streaming service that doesn't simply control an app on my phone or not work well from the outset.
Granted, there are other issues with the Gear S2, like the fact that it doesn't support WPA2-Enterprise, but all in all I've liked having it. But if I can't use it for advertised purposes without having my phone in range, then it's not as useful to me.