Great system. In the time it takes to set up my trim pro, i can have the quick trim up and running and half done. Wish we had these 50 yrs ago. My only 2 complaints are that it wont trim at max case length. It is always less. I prefer max length in order to use as much chamber neck area as possible to minimize the carbon ring. Not enough dies to cover the numerous cartridges i shoot. The necks do seem to be square.