Brakes loosening are why I avoid brakes that require a wrench to tighten - sucks when they come loose and you don't have a wrench on you, especially during a match. My APA lil b@stard brake always liked to come loose.
I don't have issues with the Insite brake coming loose, but since owning the APA I'm paranoid and snug up all my brakes by hand every ~50 rounds or after every couple of stages so that they don't come loose.
My Area 419 is not a "bad one", it's just like all the others that they produce. I personally think they could benefit from some additional machining - radius the edges or at least softening them somehow would be a nice touch so they aren't cheese graters on your hands. It may be subtle but the quality of the machining on the Insite brakes is better than the Area 419.