This is a simple service that does landing pages pretty well. I have been very happy with their level of functionality for a very low price which is: free for most of the functionality. So if you need to whip up a quick landing page than this is definitely a place to go and while it may not be super robust and have all the other things a platform like WordPress has, it still gets the job done. Also it offers some level of tracking so it's pretty helpful when you're just getting started and want to have a landing page up. I read their guide about conversions and info marketing which was pretty good and comprehensive.
Purchased a landing page from Unbounce through themeforest. The purchase I made said nothing about needing a membership with Unbounce in order to use it. Paid $19 bucks for a landing page that I cannot use unless I fork over $49/month(at the very least) to use it. Oh wait, there's a 30-day free trial though SMFH. These sites shouldn't be able to hide the fine print the way they do!