I`ve used them and they work. I just don`t like the way they do it and the line they leave in the case neck. I personally like the old way of crimping in my bullets, and the old way feeds alittle better too. Actually I don`t like anything Lee make. Over the year since I started reloading, in 1965, I`ve had alot of Lee junk and it all way. Sooner or later it would let me down big time, and some of it I though was doing a good job for a while.