I was fortunate enough to pick up a set of the .080 Step Piranha Jaws from the guys at MMM-USA. Let me tell you, there's a reason these things are constantly sold out. Aesthetically, they look fantastic. All critical surfaces are ground, and the laser engraved scale on the top face make loading stock a breeze.
I've been running Aluminum, 1018 Carbon Steel, and 316 Stainless in these jaws, and have had no issues concerning rigidity or parts moving. In addition to the serrated teeth, they have a 45 degree dovetail to increase holding force, although I haven't come across an application where that was necessary. I highly recommend these jaws. Keep an eye out on their Instagram page for details on replenishment, as well as new products they're releasing.