I feel I need to reiterate how amazing this knife is. Wow. I love it. While my 0550 is out being resharpened, and my 0560 is out being replaced/repaired, this thing has been a joy to use at work and at home. I love it. The blade is gorgeously beefy, but the high flat grind is choice, and cuts very well. The handle is just big enough to fill my entire hand, and even though I'm partial to the thickness of the ZTs, the thin handle feels like nothing in my pocket. The sub frame lock is fantastic, has a relatively early lockup, but sits firmly and there's absolutely no play.
I also have a Piston here, but the Knockout has a firm place in my pocket. I love it, I really, really do. I love how it looks as well, it's got kind of a shark shape to it when it's open. The aluminum handles are a joy, especially without jimping. I'm not sure why anyone would want this slick design in G10, or with any grip augmentation. It comes out of the pocket quickly, and slides back in quickly. The contour of the handle gives fantastic grip.