I run a Multisite network of baby blogs for my three children. This plugin is perfect for my sites.
The plugin is so easy to use, anyone who posts to the blogs can easily insert photos from Google+ galleries. I can sync galleries in Picasa2 instead of having to upload photos through WordPress. The slideshow supports mobile, so on my iPhone, I can swipe through the photos. Setting up the plugin is dead simple.
This plugin is very cool.