Absolutely useful feature extending and expanding options for organizing media library files in wordpress! Adds great usability and comfort to the rather spartan way wordpress lets you organize huge amounts of uploads. Should be part of the core ;-)
Matthias is very fast to respond to issues and requests and continually improving this plugin. We rely on it completely now for managing thousands of products and other post types. Highly recommended. Tried various alternatives - but this is very much the fastest, cleanest and most compatible with continued evolution.