After 31 years of loading on an RCBS single-stage, I finally broke down this year and got a Dillon BL 550 press. I am very pleased with it, and it more than suits my needs.
I load different than most people. I do a "hybred" progressive process. For me, brass reconditioning and the actual reloading of said brass are two completely separate processes. I would never be comfortable with breaking down and reloading brass in a single progressive process. I want to clean my brass after flairing. I want to prime by hand. I want to powder charge by hand, using fifty-round loading blocks, where I can see all the charges before adding the bullet. But that's just me.
All that said, I only need two stations for brass reconditioning; and two or three for the actual reloading. So the four-stage 550 is more than I actually need.
I am extremely pleased with my Dillon unit. The fit and finish is excellent. I'm not a machinist; but I know well made mechanical stuff when I see it. And Dillon makes good stuff.
I enjoy brass reconditioning and hand loading. Having equipment that doesn't work right and gives nothing but headaches would defeat one of the most important (for me) purposes for hand loading - enjoyment. The overwhelming positive opinions of Dillon equipment here on TFL thoroughly exceeds the anecdotal; and that is why I chose Dillon. I made the right choice without any doubt whatsoever.