This tool works very well and is easy to operate. I was careful to follow the directions exactly and not overcrimp. It is a little difficult to see into the working area to be sure that crimps are rotated from each other correctly and not all lined up in the same orientation. A bright light helped. It is also tricky to position the stops in the tool because they are short and have just enough length to hold the required three crimps. I have had no failures yet.