This is an unbelievable quality knife for the price it is. The thumb stud likes to be pressed in an upward motion, rather than outward. By doing this you can also position your hand farther down and middle finger flick it open too! Drops shut with just a few light shakes. Very smooth action, perfect size, excellent blade shape, perfect centering, absolutely no blade play, and premium materials. Highly recommended! Have already ordered another QSP knife, if that shows how pleased I am with QSP. Buy it, you won’t regret it! and you can’t beat WMK pricing! Thanks!