So far, so good for the upgrade from Gallery2 to Gallery3. The new Google Earth feature integrates even better than the semi-supported ad-on for Gallery2. It makes it worth it to get a GPS attachment for your camera.
Still tough: mod_rewrite rules to make search engines happy. It also requires a PHP pagination code update, and navigation is still broken on one return link.
All in all, I've done far less syncing of directories and hand-editing of files to upgrade from 2 to 3 than I did from 1 to 2. Then again, I'm not all there yet.
