Just picked up an OD-1 from my local Wal-Mart today. Nice knife, as others have said, like a brother to the Leek in terms of overall size. Took me a while to figure out how to work the flipper (stood there looking stupid while the girl in the sporting goods section watched me). Turns out I was gripping the body too hard and pushing the frame-lock against the blade. Once I readjusted my grip, it flipped great. So, only downside to the OD-1 is that I have to pay close attention to how I hold it if I want it to flip smoothly.
I may go back and check out the Zing and the Skyline next week.