I've only owned Dillon. Started with a 550, bought a used 1050, then sold the 550 and replaced it with a 650. All have been great.

Word of advice that I give everyone contemplating a progressive. Get one that you can use a powder check die with, you can't have one on a 550. There is going to come a time when you will get an over/under charge, the check die will catch it. It's not "IF" but "WHEN".