Just curious here... Rated 3 out of 5 stars

I'm just wondering what the difference is between this extension and Slim Add-ons Manager 9. Thanks.

This review is for a previous version of the add-on (6.0.1-signed.1-signed). 

You should use an addon for a while before writing a review. This addon has many configurable options unlike some others. You should checkout the adaptive sizing mode.