I'm used to tip down carry. So I'm used to grabbing the knife, and as I draw/raise my hand, I flip the blade and it is in the grip I use. I can do this as fast or fast than I can pull my microtechs(unless my hands are cold). I can't do this with tip up because I can't reach down far enough to have a good grip when I pop it with my thumb(The Gb has a heavy blade so I has to use a little wrist too) If the clip was pulled back anymore I wouldn't be able to have anywhere near a good grip when pulled fast. Not that I bought the GB as a defensive tool, but its nice to have options.
I hope when I get my cqc11, I can reach far enugh down to be efective with it.
Oh yeah, I use the clip. I don't want it near my gun on my belt and since I'm right handed, thats where it would be if I used a belt sheath.