This plugin gets all kinds of rave reviews but over the past couple of years every time I have tried to use the plugin it completely crashes my site. Maybe not right after I install, but after an wordpress update, a plugin update, a different plugin install BOOM! 404s. I understand you can't write code that will not conflict with every plugin, but I have had enough and actually decided to give feedback for once. Hundreds love this plugin and if you can get use out of it great, but from now on I'm going to pass.
Thank you and good luck