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I haven't used it, but here's a list of what's new in 4.2. It might give you an idea if it's worth upgrading or not. If you don't need the new features, then I'd say skip it.
What’s New in Android 4.2 Jelly Bean
"Android 4.1, known as Jelly Bean, debuted only five months ago. But Google’s already back with 4.2, which will be called … Jelly Bean. But while the name remains the same and the overall user experience sees only minor tweaks, there are still plenty of changes you should know about. Android 4.2 is making its debut on Google’s new Nexus 4 smartphone and the Nexus 10 tablet, both of which begin shipping in November. But older Nexus devices — such as the Nexus 7 tablet, and the Galaxy Nexus and Nexus S phones — will get the update shortly thereafter.
So what can Nexus phone and tablet owners expect in Android 4.2? Here’s a rundown of our favorite new features."