+1 to everything bearfaced said. I don't really have anything to add that he didn't already say, but I agree that the bolt action lock is just ridiculously smooth and locks up very solidly with no play. The pivot action feels perfectly uniform throughout the full arc of travel as if it's on a track. It's hard to explain, but when you release the lock, the blade will easily gravity-close by itself, gently, rather than just smashing into the handle like it's swinging freely.
I guess I wouldn't exactly call it inexpensive, but the Sage 3 really feels like a high-end custom quality piece to me. I have the blue G10 version and actually like the color even though many do not, but if I lost it, I'd buy another one in CF without hesitation.