Though the plugin has many features, has a huge download volume, and overall high ranking, if I consider the amount of time spent trying to find answers to questions online, purchasing the pro version borders on being a not-so-good investment.
As an example, if you go to any of the support pages for designing pages (subscription, un-subscribe, creating themes, etc.) I'm sure the instructions make sense if you are one of the developers reading them. But if you are an outside (literate) user trying to determine whether to purchase or not, they fall far short.
Anything beyond a barebones install and implementation is beyond confusing, and I've been doing WP for over 5 years.
My experience with their support has been abizmal.