On a not-unrelated note to my last, Colin Devroe wrote this last month:
All pop-ups on page visit should be blocked. I don’t care if you’re giving me 100% off, I don’t want to see the pop-up. No, wait, how about only if you’re giving me 100% off is it OK to show me a pop-up. Thanks.
Colin Devroe, Untitled
I agree 100%.