This is Buck's first automatic knife. There are some other companies that have modified Buck knives to make them automatic, but this is their first factory offering. When you hit the button to open this knife, the blade springs out quickly and locks in soundly. The button is a bit on the small side, so if you have gloves on you may find it difficult to open. Otherwise the button feels just right. The blade is right at 3 1/8" long and the total length is right at 7 3/4". Definitely not a small knife, but you don't feel weighed down carrying it. The stainless steel blade holds an edge very well, and if you need to sharpen it, it also sharpens up easily.
I know that not everyone can legally carry an automatic knife, but if you can in your location, definitely check out this no frills Buck Impact.