Let me start off by saying i love the concept of Gantry and would love to make it work. However, . . . there's BIG problems with this software and Rockettheme wordpress themes.
First, I can promise most people will have problems and errors installing the theme, etc. . . . this is just the beginning.
Next, once you get it figured out, you will quickly see your website moving so slowly you want to cuss. You will contact your website host because you've researched on the internet that it's their fault. Then, you will learn it's the "rok" plugins and you will curiously remember that all other themes run fine. Then the rok plugins will lock you out of your wordpress site until you go in through FTP and delete the offending plugin file. All of this going on while you're waiting for a response from the Rockettheme forums.
Finally, after you've wasted a months worth of late night hours, cussing the computer, etc . . . you realize that Gantry themes by Rocketthemes is just not gonna work. So, you ask for a refund and are told no.
So, you bought all this rocketlauncher stuff, spent hours, looked for fixes to bugs, only to be told on the telephone by your webhost that "rok" plugins are slowing site down.