Watched Colion North and a couple of others. Interested in the slide serrations. Instead of grooves cut into the slide, they have machined ridges along the slide so the ridges actually stick out from the slide. Sounds like a good grip for working the slide. Everyone is saying that it was an offshoot of the PPQ, using feedback to make improvements. And, it's part of the new "modular" fad, with different size grips and slide/barrel lengths. Should be worth a look.