Really an amazing component, if you are looking for a way to sell memberships to your site, this is the way to go. Tons of features, and for everything that it does the integration is amazing. Better than the component itself is the service provided by support. Tickets are always answered within the day, and often times suggestions are integrated into the newer versions. Updates and improvements to the component are constant and bugs are fixed very quickly.
The best, most fully featured membership purchasing component you will find.