Relaxation therapy: It's Lee for me. I also have a Dillon that is and has been nothing but problematic, mostly primer related. The Lee, once set up properly, just runs and runs and runs. I would guess 50-60K rounds loaded on this particular machine and the only part I've had to replace is the chain that returns the powder charge die. .380acp, 9mm, .45acp and 10mm.
No doubt Big Blue has great customer support - as does Lee. Free replacement parts, technicians glad to help, etc. I gave up on the Dillon 5 or 6 years ago. I would have to argue the "far superior" statement though - at least in my experience. As I said earlier, once set up and you know that "feel" of your tools, 50 or 60,000 rounds later with virtually no issues I'll probably stick with Lee. As for the primer issue with the Dillon, Replacement parts etc. developed the same issues. The Lee primer set up itself is 10 times faster and much more simplistic than the Dillon. "Faster" maybe icing on the cake, so to speak, but often times "simplistic" is the way to go. I found the Lee simplistic primer set up to work much better in my experience.Not sure which Dillion model you have, but I would give them a call. They are extremely helpful with "no-charge" parts, and technical support. They have stayed on the phone several time helping me to work through a particular issue. I currently have three Dillion presses, a Lee Pro 1000, and a Lyman single stage.. Like a lot of folks, I started out with Lee. We all know when operating a progressive, it's in the feel. You immediately know when something is wrong. That goes for any progressive press. My Pro 1000 works fine, but hands down - Dillion manufacturer's a far superior product. And their technical support is the bomb! If you have a primer issue, call them and get it corrected. Best of luck!