Google's latest version of the Android operating system is here and will be rolling out to a precious few devices later this month. Unlike the last iteration, Android 4.1 Jelly Bean is more about refinement than revolution, but a new feature called "Google Now" has the potential to finally achieve some of the promises we've all heard from smartphone companies for years now. Beyond that, if you're one of the (sadly small) number of people who have used stock Android 4.0, there's nothing here that will throw you off.

Within that familiar framework, however, are changes both subtle and not-so-subtle that make Jelly Bean feel robust, grown-up, and most of all fast. Android development is beginning to look like Intel's processor development: there's a "tick" with major UI paradigm shifts that re-imagine what an Android device is and then there's a "tock" with refinements that iterate on what was done before.

Is Android 4.1's "tock" on top of 4.0 enough to convince Android users to switch to a Nexus device (or agitate to get manufacturers speed its deployment on current devices)? Read on for the full review.