I have a Lion machine and a Mountain Lion machine. Software Update has offered to upgrade Safari from 6.0.5 to 6.1 on both machines. Is this upgrade worth it? Any issues or glitches? I didn't find any comments on this upgrade on the web.
Upgrading to latest software version is generally a good idea for security and performance reasons.
Specifically Safari 6.1 brings its lot of security fixes: http://support.apple.com/kb/HT6000?viewlocale=en_US&locale=en_US.
In terms of functionalities, Safari 6.1 brings the following:
Whether you should upgrade to Safari 6.1 is up to you. I recommend you do.