Quality Design
I've had this a few years and it has survived hard use very well. The small thumbstud is cut like jewellery which makes it grippy, and there is a bit of weight and length to the blade so a reasonably firm push more forward than outward makes for very fast opening and locking. This is why I often pick it up for a day's work ahead, it's one handed operation is so handy, the lock is secure, and the blade holds a great edge. On really hard use there is some slight twist in the handle which has been harmless, the blade still centres perfectly and nothing has ever got jammed in the lock either. Dropped on the floor the blade can fly half open, and I have to remember not to carry it anywhere, it's definitely not legal.