I first heard about this release from the Internet Storm Center, a great source of news. So, I did a few Google searches and nobody seemed to be screaming that it brick'd their iPhone or iPad. I just finished updating my iPad. Then I saw this article from Sophos saying you really should for security reasons.
From the article: "But you ought to have grabbed it with both hands for security reasons: iOS 6 patched a whopping 197 CVE-numbered vulnerabilities in 41 system components"