This plugin is terrible. It looks nice, it seems to offer some great functionality, but the stress and hassle that it causes when things go wrong (which they always do), are just too much.
I have developed many sites for clients and abandoned this plugin long ago. I recently thought I would give it another go, thinking that the developers may have gotten their act together, but it's proven to be nothing but trouble.
The lack of support is pitiful, and I'm not even sure the developers of this plugin really know what they are doing.
A great WordPress plugin wouldn't try to break the mould. Instead, it would simply harness and augment the native functionality of WordPress.