I've been using GroupLeads for about 3 months, and specifically to handle several FB Events. The tech support that Jamiu provides is unequaled. Although Jamiu primarily targets the Chrome browser, this Firefox version can't be beat. It is clean, efficient, and saves me HOURS of manual work and Zaps in data and group management. I highly recommend it. Worth very much more than the price. -- one more thing, I almost never write reviews, but this is so good that I felt compelled to let you know.