I'm not personally bothered by this popup, I close and forget. But the style is very intrusive. And the content is... meaningless. "Go premium" only mean "pay" but it's not a pay-incentive, it's more a leave-incentive. People don't pay when they're asked to do. They pay when they see benefits. There is a confusion between the goal and the process here. The goal is to make people pay (and it's fair) but the process is to make them use EN more and more (and better) - with or without paid features. So the message should better be some kind of "how-to", use-cases and testimonials titles, leading to blog posts (or embed contents*, or shared notes), than this useless "give us money". edit: * like the "announces" entry in the left panel. There's maybe something to do with it, like make it unmovable for basic users and displaying tips... Some may complaint but at least it only appears while actively using the app, unlike popup windows.