I had the sa37's installed last week and went to the range on Saturday. I was only shooting at 7 yards but I found poa/poi to be spot on. In measuring the dots (placement and height from slide) they appear to be the same as the stock sights. They look like they were made for the Shield. I saw the HD's on a Shield when visiting ATEi to have a trigger job done and to me the sa37's look like a better fit for the Shield, although the HDs are arguably slightly better for SD.