The only vertical split rings I've used worked OK but if I had to remove the scope, the scope became loose in the rings.
X2, not a problem if the scope never leaves the rifle. The vertical splits are more work to rezero when you have to remove the scope to do a proper cleaning like the A17 with low rings. Leveling the crosshairs can be more difficult in vertical rings. Vertical rings have less screws making less potential failure points. They are more streamlined for less hangup points.
