I have used these heads for over 15 years and they work just fine. The adjustment screw for the throwing distance is a pain to get to, requiring a small flathead screw driver but once they are set your good to go for several years. Setting the left side of the spay pattern requires a strong grip but again once it is set your good for many years of service. The spray pattern is adjustable to a full 360 degrees which requires fewer repair parts to stock if and when you do have a problem. The heads set flat to the ground which makes for a smoother appearance in the yard. The heads pop up 4 inches which clears the grass nicely and they retract all the way reliably. Once these are setup they are worry free for many years. I have tried other heads, and there is nothing worse than going around the yard knocking down spray heads that refuse to retract when the water shuts off. These heads are very reliable and are very versatile. With a good head to head coverage pattern you will have a beautiful yard using these sprinkler heads.