Fantastic, thanks for creating this awesome plugin.

Was looking for a way to get around this limitation I found myself in. I had created numerous custom sidebars using the WPMUDEV Custom sidebars plugin and when updating to a newer version of my site theme I had lost all the sidebars. Well not lost, they were actually marked as inactive widgets. It would take a very very very long time to manually drag all the widgets back into the custom sidebars I had created. After kicking off the new theme I simply ran the import and voila, all my custom widgets were back into their custom sidebars!

Thanks Again!