I will be the dissenter here. I had a 550 sold it and got the 650. Now the 650 is a heck of a press and it will almost load ammo as fast as you can blink. But I discovered the reloading with the 550 was relaxing. With the 650 you reload for 20 minutes and you are dine. Not enough time to wind down and relax. The 550 will load 1250 rounds a week if you spend just half an hour a day 5 days a week with it. Very few people need more output than that. I wish I had kept the 550.