I have been dealing with several rebuilds of sites, from Joomla, Drupal and what-not, each of them an old version that used a non-SEO-friendly structure. Moving to WordPress, I needed a plugin to resolve references from old URLs and this was just heaven-sent.

I used the free version initially, to get started, but quickly realised how powerful and extensive the pro version is. I am not gonna use anything but pro from now on..