I noticed after purchasing iContactPro + however, that all the reviews said that people hated it, and at least one... I think more... claimed that it trashed their contacts in iCloud! Even worse, if you click on the link for Support in the iTunes Store information about this program, you are taken to a web page in Chinese, which means for those of us who don't read Chinese that there us no support.
I deleted this program from all my devices after that.
iContacts + however seems trouble free... no bad reviews anyway... and also can delete unwanted Custom Contacts, so I left that one installed at least for now.