I put a 10X bushing in my CZ75 over the weekend and now I'm shooting mostly bulls eyes.
The only time I'm off is when I do an extra "something" other than pull the trigger.
It does a great job at showing me what I'm doing wrong and what I'm doing right.
FWIW - To install the bushing, I put my slide in a vice, then took a couple of pieces of 1/16th" rod (@ 1/2" long) and set one on the cut in the slide where it goes through the front sight, and put the other piece of rod in the cut on the new bushing as I was about to install it. This made eyeballing the match-up of the bushing and the slide much more accurate so the roll pin went in without a fuss.