Love the unit due to its larger window and triangle display. Triangle works great close (center triangle) and further away (use tip of triangle). M&P CORE users will be disappointed to find that you can not adjust the sight while on the gun. The space between the rear locking screws (Deltapoint) and the rear iron sight (CORE) is too small for the TORX T5 wrench to fit between. You will need to heat up the wrench, straighten it and then bend it again so that it will fit. Otherwise you will need to remove the sight from the gun to loosen the set screws, mount it, sight it, remove it, tighten the set screws and then mount it again. Leupold needs to get a fix for this asap as they are loosing business (although I kept mine and modified the TORX wrench). Overall happy now.
Cons: Can't adjust on M&P CORE
This review was written in the old system and had content requirements that are different than reviews written today.