My rescue knife when I was working was and is my Al Mar SERE 2000. I cut people out of seat belts, cut down hanging victims down, all kinds of stuff. What I never did with it was break a window.
Who are they marketing these tools too? Not the fireman, he has dedicated tools for the job. If it is for police and citizens they really need to do a better job of emphasizing the need to wear gloves when you use these or you will shred you hands. The best way to break a window is to snap an antenna against it.- George