I think that the design was ahead of its time. Actually I thought that it made a better boot knife, as the grip was not flat enough to carry against the chest, but it made for a good fit in the palm. But my favorite boot knife was the Culloden, and my two favorite neck knives are the Double Agent 1 and the Secret Edge (my Culloden replacement since I lost it out of the sheath one night). I find the Edge to be more comfortable, but the Agent is very secure in hand, however it is a little slower to draw from the sheath.
My Vaquero Grande has the kydex sheath for inside the belt carry, and in my opinion, it can't be beat. I have a newer Vaquero XL Voyager which is an inch shorter in blade length. A good knife, but the clip is way to stiff. Short of carrying a Bowie, the Vaquero Grande with the sheath is the ultimate.