They speak the truth - you won't get a big mess if you heap the cups. I accidentally baked mine for about 28 minutes - the tops are not peaked for me; they smoothed out, did not cave in. Tops are crispy and help balance the moist crumbliness of the interior. Chocolate chips form little pockets of melty chocolate goodness.
Chewy Caramel Turtle Bark. Make sure to cool the caramel completely before adding the chocolate or the chocolate separates when you cut the bark. And it's easier to cut if the bottom of the pan is completely covered with nuts!