It is a bit more complicated on the surface... as I am an ADDT owner, as well, I know exactly what you're talking about.
But, I do love the added flexibility - where you can combine several rules to make groups... something that ADDT wasn't as flexible in.
For example, you may have four levels on a site, so you create rules like "user", "poweruser", "admin", and "superadmin".
Now, with WebAssist - after you create your various rules... you can though go to the groups manager to say, allow access to all admins by allowing anyone who meets the conditions of "admin" or "superadmin".
Or, you could add a group for all actives where it includes all four groups.
When I started creating super complex applications, I found WebAssist's model to be far superior. For a single quick project - the ADDT method was great - but the limitations of the ADDT method showed when you needed to couple groups together.