It took me a bit of time to upgrade certain part of the site (mostly the blog), but it was worth it as we're finally running our own website on the latest version of umbraco.
I posted about the release of version 7 almost a year ago. The main upgrade is to the backend UI which has been given an overhaul. There is new functionality we still need to take advantage here, but I'm liking what I've seen so far.
