"This is the ideal extension for anyone who has more than 200 products or more than a few categories. Or products which can fit in multiple categories. It allows you to set rules once on a category page and the products just show up on that page. This is the one tool that Magento should have offered natively and makes the platform now so much more functional.
In addition, there was one small bug in the original extension that the developer fixed immediately and deployed it to the latest version. I cannot express to you how many hours of upfront and ongoing maintenance this extension has and will continue to save us."
OpenMage Dynamic Category Products
