I switched to Android Studio right after it came out, mostly because my Eclipse install needed to be updated- which usually means having to reinstall the Android SDK and re-import my projects (a chore).
It ended up being some serious work to import my projects to Android Studio. I wouldn't recommend it if Eclipse is still working smoothly for you.
The main thing I like about Android Studio is that I heavily use RubyMine for server-side work and the interface is nearly identical.
The other big advantage is that all the config files are a lot more transparent and repairable than those used by Eclipse.
Gradle is much more transparent and portable than Eclipse's build system, but it's still pretty frustrating how slow it is. I think moving to Android Studio/Gradle doubled my build times.
Finally, Android Studio is still pretty unstable and it usually takes an hour or two of surgery to get my project to run again after an upgrade.