I believe that popups are a significant part of email collection, retention marketing in general, and Conversion Rate at all, as they shift the user's attention to important messages. Claspo is an excellent tool for that, as it has both classic popups and gamification flows to get the best conversion rates. I like advanced triggers and the possibility of not "over-spamming" your customer with repetitive or irrelevant popups.

We have purchased Tier 4 for our agency and recommended it to a dozen Clients. Such a Lifetime deal is a really good one.