Trying to reload fast changes the entire ballgame of reloading, that is for certain. When I realized how much my expenditure of 223 was going up, that was finally the impetus to invest heavily in a higher-end progressive press. It's a long-term purchase. (Incidentally, also finding out that my reject pile of cheap 55gr reloads was still infinitely more consistent and accurate than steel-case didn't hurt, either.)I don't, nor plan to ever, sit down and pre-prime hundreds and hundreds of cases. So maximizing speed isn't a priority. I'd like to speed it up and I don't mind a bit more safety here...
I haven't gotten in to large scale reloading yet. Mostly just loading 50 rounds at a time (or less). Trying out loads. I've probably loaded 600-800 rounds so far in the last 9 months of real reloading.
I think the Lee APP and ACP make a lot of sense for the crowd that's loading on a single stage, especially with a quick change mount system, or do not have an on-press prep solution. You can prep/size your brass on the APP, swage if needed, prime it on the ACP, charge it off the press, and then seat the bullets using your single stage. I lean heavily towards doing everything progressive these days, but it is expensive to set up new calibers on the 1100 and Mark7, and if I'm loading precision, sometimes the math does not work out.App was/is nice. I sure as heck don't mind pre-priming a ton of cases. Maybe if or when some day primers aren't as scarce. But I don't really want to prime a few thousand cases and then find out "oh, I wanted to prime this stuff over there instead".
But anyway, if I was going to run up 100, 200 rounds, the Acp sounds nice.