I have one of the very earliest 650's. It had been a source of endless problems since purchase, we said it was named the "650" because I could never load more than 650 rds without something breaking or going out of adjustment. Lucky for me, I was getting lots of free ammo from my PD employer and didn't need the 650 much.
After I retired and the free ammo stopped, I started using the 650 more again. Lots of problems. About 2 years ago one of my many phone calls to Dillon about yet another problem, got a comment that mine was an early machine and they'd had lots of problems with them, it needed a new platform and lots of other parts. They sent me the parts free but some of them were incorrect, some were missing, the instructions were incomplete and/or misleading, and my repairs were turning into another FUBAR. Eventually, I persuaded a rep to tell me the process to return for rebuild. They really didn't want me sending it back, they only told me how when I said that "tomorrow, this machine will either be on it's way back to you or in the garbage can."
I had to pay for the shipping and a fee for the rebuild. I also asked them to install the parts to load .380 Auto, adjust properly and charge me whatever was appropriate for the parts and extra time, which they agreed to do. I sent them some empty cases and bullets to practice with, and a detailed letter explaining what to do.
The machine was returned to me at exactly the time when I told them in advance both by phone call and two letters, not to return it. It would have sat outside in the rain and snow for a month except for a neighbor. None of the dies were adjusted at all, and the dummy rounds they "loaded" had the FMJ bullets seated backwards, like wadcutters. Lots of other things were not set right, it became apparent that all of the new parts had been just slapped on and nothing was adjusted.
Eventually I got it running correctly, but it was a very long and unnecessarily difficult process. Basically, I like the 650. But the customer service experience was something less than great.