I have two Dillion RF-100s (one in small primer and one in large primer). I found both of these machines to be exceptional with no flipped primers at all. It really is a 'load and forget' machine. I have a Dillon Super 1050 that in one sitting I will usually crank out between 1000 -1500 rounds at a time, thus for that volume I found the RF-100 really is nice to have. Is the machine a 'must have'...no, I loaded the primer pickup tubes for quite some time, but then again a progressive machine isn't really a 'must have' as one certainly can load with a single stage. Thus, like a single stage vs a progressive press...it comes down to an individual's load volume against the amount of time and cost they wish to spend doing it.
Just my two cents (ok...1 1/2 cents).
Take Care,
Mike