I owned a 550 and it is great for low to moderate volume. You have to manually fed the cases and index the shell plate. If you load several thousand rounds at a time then you will probably need / prefer a 650 with a case feeder. It auto indexes and runs much smoother. I can load 800 plus rounds of 9mm per hour on my 650.I tend to prep all my brass before loading, so that’s not a big issue.
General concenseous seems to be for a Dillon. What are everyone’s thoughts between the 550 and the 650?