I have 3-SVI's with J.Point slide mounted dots, and I have several with side frame mounts ( i'm a Lefty ) I was told the small glass on the JPoint was a dis-advantage, but I have finally run a match with the Slide mount and found the small glass, forced me to focus more, and dot just 1/4" above the barrel, made re-acquiring the dot quick. if I could see the barrel at the bottom of the glass, I could find the dot. I like the side mount for the c-more for the same reason, it gets the dot within 1/2" off the top of the barrel. Seems easier to pick-up having the top of the barrel as your reference.