If l had to chose just one of "The James Brand" range then this would be it. The "Medium" version is the perfect size for my hand. I do not even have to use the thumb disc. I simply pull down the locking buttons & use a downward motion. The inertia created opens the blade & locks it into position. To close the knife, all l have to do is to pull down on the buttons again & the blade glides back to its home position. I cannot do this with the XL version. I need both hands to operate the knife. As the name suggests, the XL version is for people with large hands. I must stress, however, that any collection would not be complete without at least one XL knife. My medium knife is lighter and perfect for an EDC. I ❤️ it. Simon, from Adelaide.