I find all of the discussion interesting. I can see all sides of each point of view.
I have loaded on a single stage for several years but by no means consider myself an expert. I feel very comfortable running a thousand or two at a time one step at a time for various calibers.
This past weekend I spend some time with a friend who has a Square D and a 550. I am a very mechanical person but the shear amount of activity that is taking place with a progressive is considerable. I have been considering a progressive for a couple years and had pretty much decided on the LNL with the 650 the choice if money were no issue. However, after this weekend progressive introduction I am not certain a progressive is for me. I like the single product completion and allows me to inspect each step of the way.
But that is me.