Include the freedom synching feature with imindmap hd plus at no extra cost.
The imindmap hd app does not allow synching more than 5 mindmaps. This is identical behaviour to the free version. Synching data is no longer a nice to have feature. It is essential to be able to backup valuable data without having to pay for the privelege. Dropbox, googledrive,skydrive,box all offer free storage.
Ideally imindmap hd should leverage all or some if these locations also allowing the sharing of mindmaps.