Two months ago I bought a used Dillon 550 B, it look dirty and abandoned, with a lot of rust in some parts. After cleaning it and lube it; it works like a dream!!!!!! For my point of view its an outstanding press. Yesterday I change from 380 to 38 spl, and while I have to set up the new tool head for the 38 spl, it didnīt take so much time.
I think that part of the fun about reloading is the maintenance that you gave to your machines, much in the same way you keep your guns clean and lube.
Just love my Dillon. I have it side by side with a Lee pro 1000 (By the way I bought it new and works very well), an old Lyman 45 lube and size machine and my old lee single stage.