Well, we just added an additional day at the parks (this Sunday)....soooooo, long story short, those ALERTS really work well!! We now have our Not-So-ADRs.
They're not super strict....but usually no more than about 15 mins early....sometimes they still make you wait. In other words, they'll check you in, but you might still have to wait. Just depends on how busy they are. That's been my experience.