If everything worked as advertised, I would still be using this remarkable plugin. Unfortunately, I kept running into walls with stuff not working or causing problems somehow. Here is a short list of the most problematic aspects:
Strange error upon activation that the “/wpseo/” directory could not be created (could not resolve this; no idea what it means)
With the plugin enabled, category tags and templates did not work
After uninstalling the plugin, category permalinks did not work
None of the Sitemap functionality seemed to work – no sitemaps were created or updated
WordPress’ paged-comment links don’t work when “Redirect ugly URL’s to clean permalinks” option is enabled
Could not for the life of me figure out how to do the “clean uninstall” that is advertised for this plugin
Empty/broken “File Editor” page (not sure what’s up with that)
Insertion of “Plugin by Yoast” credits in the source code – even on pages that include no plugin output
