This is an AMAZING knife! I'm a knife nut and have owned MANY folding knives, and NONE of them has been easy to "flick" open with my thumb or index finger. But this knife opens in a FLASH just using your index finger to pull the serrated lever - WOW, what a surprise! It's also a very solid and strong knife, and, for the price, is an incredible BARGAIN. I got it for some friends as a car "rescue" knife, but now I'm getting one for myself.BTW, supposedly you need not "swing" the knife to break a window ... just PUSH the glass breaker HARD against the BOTTOM of the window (NOT the windshield - it's laminated and WILL NOT BREAK). Best window breaker is a spring-loaded punch. I don't know if there's a knife with that feature, but it would be a good idea. If the belt cutter doesn't work, use the serrated portion of the knife - it will work.Keep it clean and lubed, and it should last longer than you do.