Edge has been very good to me. So have standard/mag fill swirls. If you're expecting to use it as a truck crossing, I'd recommend sniper fill with some rebar reinforcement molded in. If you're going to use it on a lightweight hunting rifle, I don't think you can do better than an Edge. I don't know if one is stonger or weaker than the other, but I think Edge is "strong enough, plus some" for my use.
The pic that ctsmith posted would be on the way back to McMillan. I think McMillan would like to learn from any problems and would appreciate getting it back. It looks a void to me...I'd think it could happen with any fill, but I could be wrong....
