I can't quite wrap my head around having a fully-progressive reloader. My principal reason is that I don't load hundreds upon hundreds of cartridges in one or two given calibers. My world is made up of 37 calibers and 100-300 count of each. 223 Rem and 9 x 19 I have about 1K-1200 of, ~500 of 40 S&W, and ~800 of 45 ACP. Still, I only shoot 100-200 of those at a sitting, and I can refill that many in an hour using the Ponsness-Warren P-200. The P-200 uses the RCBS/Lyman/Lee dies from my single-stage presses by design.
Dillon makes excellent tools, but they are more tool than my needs can justify.