I'm all for developers getting a little cash for their hard work, but this plugin is a joke. Given the number of 5-star ratings and the lack of reviews describing its shortcomings, I'm almost certain its developers are review-spamming.
1. extremely limited features... only "like" not "share capability in free version, mandatory annoying animation, etc
2. "you need to modify your theme" warning bar which cannot be removed even if the plugin is working properly
3. ads and upsells sprinkled throughout... not just on the settings page, but on the WP page which lists all plugins
Given the broad number of quality floating social sharebars available, don't waste your time installing this one.