This plugin is brilliant if you want to use Magento in a WordPress site seamlessly. I have been programming for 15 years,and this one plugin saved me at least a month of custom coding.
If you are selling any downloadable products, then you definitely need to be using this plugin. It is the best, and easiest way to set up your own secure ecommerce site inside of WordPress.
Seriously, this is the most helpful plugin I have ever used.
The only thing better than the plugin is the support. James responded to me almost instantly and helped me quickly solve an issue I had already spent over a day trying to fix. He is even better than his product.