I've been using AEC for several clients' sites, including my own, for a number of years now. I worked with David and Jake (their support guys) with customizing AEC to work specifically for one of my client's projects a few years ago, and they did a great job. They built it so that it worked perfectly for my client out of the box, they even built it so that it could adapt to my client's needs without going back into any code.
Fast forward to a few years later, and the AEC product has been further polished and improved. The interface is much easier to use, there are many more graphs and helpful visuals for site managers (e.g. my client).
tl;dr: Happy customer, still happy after 4 years, and would recommend to anyone who needs to control access to (portions of) their Joomla site.