I recently upgraded the forum software to the newest version of Flarum (Beta 14). Generally speaking, the user experience should be the same except everything should be loading faster for you.
I had to temporarily disable the private messaging extension while they upgrade that extension to be compatible with Beta 14.
One thing I would love some feedback on! I added a "Categories" view - it gives a more familiar forum experience. You should see a "Categories" link on the sidebar, or you can click here.
I can make the Categories view the default (you would still be able to access the "All Discussions" view). Do you have a preference for one view over the other? I submitted a request to the developer of the categories extension to allow "collapsible" categories, so you can hide the subcategories if you'd like.