I've never had a single problem with my 650 primer system. Other than the fact that you have to remove the shell plate to change sizes. But you have to anyway if you're changing calibers.
The most common primer system problem on the 650 is it getting mis-timed. This results in failure to feed a primer, flipped primers, and crushed primers. Usually intermittently before becoming totally useless. You cna also start getting flipped primers due to worn parts, just like you can on the LNL-AP.
Not that there is anything wrong with the 650 design. They made some design choices. This results in a more complicated and thus finniky primer system than the LNL-AP and the 550. However, it was a trade off.
These are benchtop manufacturing machines. They are 10lbs of compromise in a 5lb bag. I'd much rather people concentrate on how to make them work right than endless pissing and moaning.
As for "implying" the 650 has issues, it does.
seriously, this is the search for 650 and problem on brian enos. You'll notice PLENTY of bitching, and most of it is about the primer system. If you actually read the threads, you will find that 80% of it is the primer system getting out of proper timing. I'd categorize it as a maintenance issue, just like with the LNL-AP getting out of timing as the pawls (or more likely the pawl springs) wear. Dillon just seems to get pass because it is easier to find an answer from the community of dillon users. I'd argue this is an artifact of their former broad support for competition shooting. They are MUCH more picky these days about sponsorship and mostly just say no.
http://www.brianenos.com/forums/ind...osts&result_type=topics&highlite=+650+problem