My theme had issues with it, but works pretty well

Initially the pop-up would not appear, but I discovered it was actually behind the page it was called from.

I adjusted z-index in CSS and pop-up appeared. If you run into this, it’s an easy fix.

Also, for my theme, I couldn’t automatically hide the header and footer using the built-in feature. The target page had a post slider which wouldn’t work so page was empty. I had to disable the “show content only” feature — thank you author for putting that option in the settings!

Again, I just hid them in CSS when the page was shown in a pop-up.

Probably all theme issues, and everything else seemed to work as expected.