Nothing necessarily wrong with the RCBS but the Dillon machines are on a totally different level. Like was said earlier, the warranty is an unconditional, 100% lifetime guarantee. The couple of times I've had an issue (all of which were my fault) and I've called to get a diagnosis and order replacement parts, they haven't let me pay for them and have sent them right out.
I'd go with a 650 over a 550 for sure and definitely get the casefeeder. I've been running one for years and I love it. The point of a progressive press is kicking out a lot of ammo quickly and efficiently, the 650 with a casefeeder is worth the money over a 550 for pure production.
If you decide to sell your Dillon setup 15yrs down the road, you'll get 75% of your original outlay back. Don't believe that, check out eBay.
