I have been using the JED for over 2 years now and I'm saying that I'm most impressed with this component. I'm not a regular guy just stumbling around the JED either, I build websites for a living and as well I teach others how to build websites using Joomla.
Look, bottom line is if you are looking for a powerful membership component, forget the other 11 or so that you see in the JED, i have tried half of them with little pleasure, do yourself a favor and if you are really serious about the business idea you plan to use a membership component with, then you will get this component.
My name is David Shields and i'm a happy customer!
This is a horrible system. It is one thing if you download a module and it doesn't work correctly then no big deal, it was free and you can just remove it. But this module does the exact opposite of what it says it will do. In fact it causes harm to the presence of your site on the net. So if you want to damage your PR, download this module.
I sent the "customer support" an email last week and have not heard anything from them. I believe I opened a support ticket, too.