I purchased tier3 (unlimited sites) and tested it on one of my sites to replace a plugin that we've used for two years with a hefty annual fee. While I was logged in, I could see the author boxes (which looked nice) but when I viewed it in an incognito window it crashed the entire site with an unspecified "critical error on this site" halfway down the home page. Uninstalled and reinstalled with the same results, so it's definitely fighting with something on the site.

I really didn't have time to troubleshoot a simple plugin, so unfortunately I refunded the three codes.