The upgrade also includes a dedicated Radio app to stream Apple Music's stations, including Beats 1 (free for everyone) and custom/curated stations (for subscribers). As on iOS 11.1, Siri is smarter about finding and discovering music as well.

And yes, there are plenty of non-music improvements. This is the update that unlocks GymKit syncing -- if you're exercising with a compatible fitness machine, you can sync your watch with it to get the most accurate data set. Have a cellular Series 3 model? You can force the watch to disconnect from WiFi if you don't want to join a network. You'll find fixes for some annoying bugs, too, including missing stand reminders, missing vibrations for silent alarms, unwanted heart rate tracking and even an issue where some original Apple Watches wouldn't always charge. In short: you want this, whether or not you have the latest smartwatch on your wrist.