[Bean][1], [Boxes][2] and [Fieldable Panels Panes][3] all provide similar functionality. I have trouble understanding what exactly the differences between them are.

What are their advantages/disadvantages compared to each other? Are they geared towards different use cases?

I want to use some kind of blocks in Panels to add custom content - content editors also need to be able to add content, in that sense the blocks I need are not pure configuration. But I also use Features...

  [1]: http://drupal.org/project/bean
  [2]: http://drupal.org/project/boxes
  [3]: http://drupal.org/project/fieldable_panels_panes