Just ordered the Nexus

I decided against the One X. $350 is just too good to turn down, especially from a trusted source (Google) and not some shady guy on craigslist. Would you guys recommend buying an extended battery? I have heard mixed reports of battery life on this phone. Anyone with Jelly Bean have any battery life changes? Mine should be arriving by Monday hopefully. (I'm actually coming from a Windows Phone, can't wait!)