As you can see there are a lot of reloading machines out there and they all have one thing in common, they are mechanisms. The key to any mechanism is intimate knowledge as to how they work, what makes and keeps them running smooth and efficient. Some do this better than others and some owners can never figure out what might be slightly off and keeping the machine functioning smoothly as well as correct any issue that might arise. As for my personal choices its the 550B as well as the Lee cast iron classic all dependent upon what I am loading. I have nothing but praise for both machines and consider them to be excellent mechanisms and very well thought out.