Although I personally prefer neck hold, I don't think center hold is entirely wrong. I aim at the center at all distances in service revolver since it is not possible to adjust the sights enought for neck hold on my Python. The big advantage is that you don't have to care so much about the target. Once you have found the point of aim, it is easier to "feel" that you're aiming at the right point and just focus at the front sight. The downside is when you shoot in strange light. Since the X is not in the middle of the target it can be tricky to know where to aim if you cannot see the X. To me the target looks bigger when shooting a bad light (for example, a rainy day or in Swedish fall, winter or spring ) and that makes me shoot high when using center hold. I simply think I see to much target and raise the point of aim.