I have tried the 2 well known extensions and found they were just too complicated to manage on a daily basis. One was creating 000s of unnecessary redirects which Google punished by 50 ranks.
This does exactly what it says on the tin - it builds the URL dynamically so when a VM product name changes, so does the URL. A log is built up of 404s so you don't lose traffic. There is a control panel also that allows you to make adjustments and for me, this is perfect.
Installation wasn't a simple Admin upload but after an email to the developer, it was sorted very quickly.
Thank you! Just to clarify, it has no reviews because it was removed from JED due to its previous license terms. But it used to have tons of reviews as it's the oldest and most reliable SEF extension for Joomla.