My first was also a 650. I started slow to learn the press. I just got it last week. Adjusting the dies takes a little time, but once your set up your golden.
Prior to any session I take mulitiple powder measurements to makes sure the grains are good to go. I love this press and glad I chose the 650 I don't have a case feeder yet but I am sure to order one for massive amounts on ammo for my Subgun