To address the question of ammunition quality and consistency, the Dillon presses produce ammo as good as any from a high-quality single stage; they just do it faster.
Going to disagree with this. Not saying the ammo you load with the Dillon is going to be bad or not accurate. However, the high-quality single stage, especially the Forster Co-Ax, will allow a lot better control of runout and other variables that reloaders who are concerned about accuracy only.
I would also bet that most if not all F-class reloaders don't reload on a progressive. Just a lot more control of reloading variables by single stage reloading everything.