I've got a zdp leek, large cyclone, and the new aluminum-handled speed bump. I love the speedsafe opening. The cylone and leek have the best hard "snap", the bump is noticably slower opening, but that's no big deal. I edc the bump now, even though the edge could be thinner, it gets razor sharp on my spyderco sharpmaker (corners of stones only). The leek is a great small/light carry, just a little small for me. I wouldn't have an ao knife without the flipper, I don't think. My only other complaint with the aluminum-handled knives is the weight, the cyclone and bump are slightly heavy, if a linerless g10 model were possible, I'd love it, hopefully around the weight of the spyderco military (my all-time favorite lightweight large knife).