On my wordpress site some information is open and some isn't. This functionality is provided via wp-members plugin. Since YOPPoll doesn't support wp-members restrictions, I must care the visibility of polls and poll results by myself. It isn't very hard, by the way, but takes some time. So the only feature I need of YOPPoll is wp-members compatibility.
Support of poll's data migration to or from other wordpress poll plugins will either be appreciated!