I have to admit I'm a little curious about this... Most people who buy a Glock do so for one specific reason... Not for the tons of safety features, not for the "sexiness" of it, and not because of the tons of extra features... They buy it because it's stripped down to it's most basic design. It's simplistic and uses as few moving parts as necessary. It does so for reliability purposes... Most who own a Glock do so because they want a firearm that they KNOW is going to fire when they pull the trigger.
This would seem to buck that in the face a bit by adding extra parts and therefore an extra safety. I mean, on one hand I get it... But on the other hand... I .... I dunno....
I'm just looking at it and thinking... Suppose somehow some dirt or pocket lint wedged itself up in there and prevented it from disengaging? I know that's extremely unlikely, but it's no less likely than it happening on any other firearm, which again would often be cited as one of the primary reasons a Glock owner owned a Glock in the first place...
I dunno... I guess I'm a bit skeptical...