As a surfer, I find those intellichat exit pop-ups annoying and spammy and they make a site feel cheap to me. I haven’t tried them on my own sites for this reason. I have seen join exit offers pop up in a new window that, if done right, I think might be a better way to do it. At least I think it would be better than the tacky ‘chat spam’ windows that pop-up.
I agree with Danny. It’s tricky. You risk annoying surfers and if someone clicking back to revisit the tour results in them getting an exit pop it can kill a sale. I think it’s worth split-testing on any site at least for 30 days to track results though and trying a few different combinations over time is never a bad idea.
Content will depend on if the goal is to be able to contact the surfer later or try to close the sale right there.