Those irwins I love compared to knipex. You can tighten them without the need of pressing the button in. Plus the grip is phenomenal IMHO. Plus they have a finer adjustment range from what I've noticed
Take a look at Eastwood. They're semi popular(putting that lightly) but I've used them and in my opinion they put my lincoln 180 Mig to shame. Not a bad tool and very reasonably priced.