This is a great plugin until you get a redirect problem. I got an error and had to totally reinstall WordPress to get rid of it losing all my hard earned SEO along with it.
Foolishly I chose this plugin again because I liked it so much, but now I have the same error again. The support for this error puts the blame on your server which is not true as I set the new site up on a different server. But if you want proper support or explanation from this guy, guess what, you have to pay him.