Howdy, I loaded on a single stage press for 30 years, long before I found CAS. When I did discover the world of CAS, I found that I was taking way too much time at the press and since I then started to load shotgun and then got into casting too, something had to be done. I simply convinced my wife that I was going to need a progressive press and she decided it would make a Christmas present. I ordered up a Dillon 650 and that cured all the time constraints once and for all. That was about 4 years ago and I have had no problems with the press and I can crank out a lot of loaded ammo in a short period of time. I load BP on mine and had to make a few minor adaptions and if there was a way to stick the bullets onto the loaded brass faster, ( I have fumble fingers ) then I could load even faster.
Dillons aren't cheap, but they do work well and although I haven't needed anything done to mine, it is nice to know that the company that makes them is known as the best there is and warranties them forever.
I still use single stage presses for long range rifle in 45-70 and 38-55 calibers, but I want my 45lc and 357 loaded up quickly.