So I had two pretty good ground fights with this holster and one of them involved some pretty good tugging on the butt of the gun. The GLS bought the student just enough time to be able to establish limb control and get the guy's hand off of it.
I'm pretty impressed. It's not a super concealable holster, but concealable enough for "detective casual".
I like it and I don't see any significant issues with it and it provides just the right amount of retention to be able to buy one enough time to solve the problem with skill.