Some comments on my Houdini purchase. Its a lot heavier than my ResQme, although more compact. The snap release is very tight and it must be disconnected to employ the punch. I had to unsnap and resnap it about 30 times to lossen it up. The tightness might well interfere with functioning in an emergency. I may add a dab of silicon. Seatbelt cutter is sharp, but not as well angled as on the ResQme. The flashlight switch must be held in the "on" position to keep it lit, albeit its bright. Finally, the whistle is not very loud or easy to blow. The two-for-one price was right, but its somewhat inferior to the ResQme.