OptiMonk is the perfect partner for website pop-ups. It makes lead collection super easy. The pop-ups are beautiful and completely customisable making it super easy to edit them and match with your brand persona. They are interactive but in no way irritating. People can have a seamless user experience browsing the website while the pop up shows up on the side.
Thrive Leads is really well suited for solopreneur service providers, ecommerce brands, and small to medium businesses. I wouldn't recommend Thrive Leads as an enterprise level solution, but I don't think they're trying to be that, either. Thrive Leads will help you if you don't have a whole marketing department (or if you are the one guiding a marketing VA) to do a better job of capturing leads and building your email list, which is the life blood of small online busines.
Thrive Leads can be easily used by anyone who has the basic skills to work within the WordPress environment and who has the knowledge about lead capture and segmentation. As a lead capture tool, I think it's use is restricted to obtaining contact information in different settings, which it does flawlessly.
In general, the support is great. When living in a different time zone, the support can seem slow but it's not. Most of the time, any issues I have get sorted out quickly and if it's not the first time, it generally gets fixed on the second go. Their knowledge base is good too although sometimes it's hard to search. Not usually their fault, more that users don't title their problems better.
OptiMonk specialises in website pop-ups. As such they have a wide variety. They keep on improving with time and make the experience better. They also offer a lot of tips and free useful content for ecommerce websites.
Both Leadpages and ClickFunnels are great products but because they are so specific in many ways they didn't allow me to use them right across an entire website. Thrive Leads has integrated their products so well that you can use them on any wordpress site and of course with all other Thrive products. I also found the cost much better and the constant updating of the software means it's always up-to-date with the market.