What sets it apart from other unit frames, such as agUF, is that almost everything is run in a modular fashion. I have also paid extremely close attention to performance, especially with regards to frame recycling. For example, if you hide one frame, all its child frames go into a big recycle bin. If you show another frame after that point, instead of making its own new children frames, it will reach into the recycle bin and reuse them. This cuts down on the number of unused frames immensely.