Plugin is so good you will want to get the premium.
I have downloaded both the free version and the premium version of this plugin. I like the diversity of options, the ease of set up, as well as the superior support by the developers. I had a theme compatibility issue and the developers quickly helped me out. After using the free plugin and getting used to it, I decided the premium would be worth the investment for the website I was putting it on. Nothing but 5 start service.