Net Promoter, Satisfaction scoring?

I’m trying the poll banner theme component suggested by @awesomerobot but I am not sure if it is working well. When we tested, it seems that the user needs to refresh the page to show the banner, even if the user has navigated through the pages for several minutes (more than the “show after” set).
Furthermore, after a day running it, just 1.5% the users that visited voted.
Does anyone else experienced the same?
I am also wondering how the view count for the post works in this case. Does it add a view everytime a user sees the banner?