Lotta good data and most Dillon 550 fans.
I went another way. I converted my RCBS Rock Chucker to Progressive with the Piggyback II. It was a logical upgrade on a budget. Family first, reloading second. Had I the money at the time, a true Progressive press would have been purchased and the Dillon 550, the Cadillac of presses, would have been the selection.
I have had to learn the idiosyncrasies of the PBII and can turn out impressive volumes of handgun and .223 Remington rounds in short order. Last Saturday I loaded 200 x .357 Magnum and IMR 700-X powder; changed heads and loaded 400 x .45 Colt and IMR 700-X powder; changed heads and loaded 400 x .223 Rem. and IMR 4227 powder. All of that took a leisurely four hours while discussing shooting and politics with Dave, my deer hunting partner.
The PBII likes to be kept clean, squeeky clean. If not, hangups and headaches will result. Dave believes the PBII is an "afterthought" to convert the Rock Chucker single stage to progressive and certainly not a true progressive from the get-go. I gotta go with that explanation for lack of a better one.
Still, never having been blessed with the opportunity to turn cases into rounds on a Dillon, I perhaps don't know what I am missing but am still making a lot of my own very good ammunition on the RCBS PBII, in which I am now, over decades, heavily invested. I got here slowly, invested as I was able, know my machine, and can make rounds with the best of 'em. I don't need one thousand rounds per weekend, every weekend, and perhaps four times per year shoot my entire arsenal.
Depriming and initial sizing are done, by choice, on a single stage press and priming is by hand only on every case. My PBII is used for final case sizing, combining partially prepared components with automatically thrown powder charge, stuffing bullets in powdered cases, and crimping. So, short of true "automation", the PBII has its usefulness in my reloading regime and my investment, while substantial, is short of the Cadillac, but I am OK with that. It works for me.