I have the new Spydie Viele. IMHO, the steel is terrific in that it holds a wonderfully fine edge for a long time. The hole is not too small for me and the notch is well aligned with it. (My hand wraps around the knife completely with the fingertips just touching the base of my palm and about 1 inch of the handle sticking out the side.) I have not had the chance to check how well the liner lock holds, but it feels very secure, probably as much as the Camillus EDC.
But your concerns about your hand being able to slide forward is a valid one. The only things stopping your hand are friction (not that much with smooth micarta and water or blood) and the 3 "finger recesses" along the bottom of the handle. Oh, and the clip offers a little bit of security as well, though not much. If you're planning to stab, the only secure way is with a firm hammer-grip with the index finger in the thumbhole recess, the last finger as a stopper at the end of the handle and the thumb resting firmly on the ridges on the spine of the blade (the thumb ramp).
This blade is primarily a slicer and whittler. The point is a bit too fine to survive stabs in to hard material and may be better used in the utilitarian task of removing splinters.
If you're worried about having to stab there are more "combat-orientated" handles out there which have positive stopping for your hands like a proper finger cut out or pseudo guards. One of the best designed, IMHO, is the Emerson Commander. Another (if you don't like dull black handles) is the Kershaw Boa.