I have used a traditional grease gun for several years now. Have I had grease everywhere after using the gun? yes I have. It just seemed like the way it was supposed to be. A friend suggested trying this type of fitting and said it was much less waste and mess. After replacing the old coupler and priming this one, I have to admit I am sold on these newer style locking connectors. They go on solidly and there is very little to no mess when taking them off. Lubing my trailers was an all afternoon task, and now it is much faster with higher confidence that the grease went where it is needed rather than some of it on the ground.