My assessment

I hate giving negative reviews on a product as it is more than just a product, it is their reputation as well. Lord knows that WordPress should have done something with their media library instead of making as their #1 priority the creation of the Gutenberg Editor that people in general hate.

I downloaded the free version of MLF and tried it out. Here’s what I liked and disliked about the plugin.

PROS:
– you can use the free version.
– it creates physical folders
– Author reviewed my questions within 24 hours.

CONS:
– don’t try and process more than 100 images at a time… This statement was made by the plugin author himself: # of images

– The interface could be improved. If you are moving/copying files from one folder to the next. Forget the drag and drop approach. I would have used a WordPress approach where you choose the source folder (click), the folder opens and displays all your media with checkboxes next to the image-name WITH a checkbox that can be used to SELECT ALL images displayed on a paginated screen. User can SELECT ALL from the number of media items displayed in a paginated list. WordPress does this and it works just fine.

– add a FILTER for image_name.

– Speed up the move process and don’t blame it on the fact that it has to search the entire database to update/replace the links. I don’t have the time to analyze the code in your plugin, but if it were me I would be building arrays from the wp_post_meta table and wp_posts table for each image as the first step to speed up processing.

– You would not need much memory to store post ids and image URLs. I still cannot grasp why a move operation failed processing 5000 original images and thumbnails combined and left my media library in a state where the physical folder was missing, but a virtual folder with images existed in the MLF media library. WTF.

– Show a count of items that are selected and display another count after the process.

– 2 words: Log File – Never found one.