They are great to have and to supplement stoppers. They go in a little quicker and have to be more secure if there is a bit of a flare. I don't know if it's justified, but the wide cams inspire confidence. I placed it the first time out, but I'm of the leader must not fall school, so I can't actually attest to their holding power.
This review was written in the old system and had content requirements that are different than reviews written today.