I have a great deal on a Burris speed bead for an A400. I was looking to hear real experiences with these red dot sights for duck hunting. I don't want the you don't need a red dot to shot ducks. I shot great without one, but I've always wanted to try one out. I've heard positive and negatives, but most the negatives just say its stupid with no prior experience. What are the personal experiences from hunters on here?