Chiggie: I am very impressed with the Nighthawks durability. A great tactical knife for the money.
The only thing that wasn't answered, for me, with your video is how the variant with the serrations holds its edge. It's the one I own so I'm a little curious.
I'm not too worried though since if you get the serrated model you're probably more worried about using it in a tactical sense, which I am, and unless I go up against any mutant concrete monsters I think the blade will hold up just fine. I was just happy to know that it is strong enough to handle just about anything else I might care to use it for.