What do you mean, how do they stack up? Are you asking if the internal beadlock is really worth the pain and weight over just a "regular" beadlock (one beadlock ring on the outside of the rim in this case)?
Why don't you just poll all the people on the forum if they've ever popped a bead on a regular beadlock rim and you'll have your answer. There's plenty of people with them to have a decent sample size.
To start, I have ATX Slabs, usually run 10-12 psi offroad and haven't popped a bead.