A great many people buy 550s and never purchase another machine. I have heard that the 550 is purchased more than any other Dillion reloader. It is simple, affordable, and it works! Others want to have more features, and eventually upgrade to the 650. Only you can decide what your needs are. Whichever machine you finally decide upon, I am sure you will enjoy using it. Steve Wanna kill these ads? We can help!