I have used several different types and all have helped my aging eye sight. They really would’ve helped when i was younger and had great eyesight but less patience. I like the low profile FF3 and Venoms best. I always have extra batteries attached to the gun. One gun has a very low profile mount that i can even co witness the rifle sights I used previously. I always make sure before i start the season that they have new batteries and POI = POA. Then i go and try to shoot turkeys in the face with them. The good Lord has blessed me with this tool that will keep turkeys dying and not many wounded as I hopefully keep getting older.