This is my first time posting on here. And Noticed while looking through the forum that their is a bias towards Gear-Driven over Impacts. I have been working with irrigation since i was 6 designing and installing sprinkler systems since i was 13, not professionally of course, just for family and friends and my self. I have always used Maxi/Mini Paws, and have had much success with them. only replaced a few. I have a system with 14 heads and have never had to do anything with them. I am not a professional as you all are. so Id like to know why the bias towards Gears over impacts.