I bought the 3 site pack for £100 for the year, followed the guidelines to build focus pages of +1800 words, that's when the plugin failed miserably. Despite actually writing 2000 word, the plugin only saw 328 words so I couldn't get past that stage of the plugin. Support told me to deactivate plugins, but this is an active eCommerce site, getting sales is one thing, SEO is tough enough, and I don't need to have to fight the plugin as well.
The Keyword search tool is a good feature, but you have a limitation of how many times you can use it, (50 was my limit) before you had to stump up some more cash, and the emails... oh the amount of rubbish these guys throw at you, someone needs to install a filter in there, cos they seem to think that now you have spent some cash, they have every right to market to you on a daily basis.