I own and use a Dillon 650, and I have mixed feelings about it.
It is expensive when compaired to other equipment on the market, but you do get what you pay for.
The 650 is tricky to set up to get it to work 100%; the primer feed system sure could use some improvement, as I have more trouble with that than any thing else.
On the plus side, when you get it all adjusted just right, it runs very well.
I only load pistol ammo on my Dillon, but my son just bought all the stuff needed to load 223, so that will be a first for me.
In my opinion, all progressive reloading machines except for maybe the Dillion 1050, just assemble ammo.
They do not clean out the primer pocket, they do not trim the case or deburr it
They do not weight each powder charge, they do not measure overall assembled cartridge length.
Again in my opinion, if you want high precision reloaded ammo, a single stage press is the only way to go.
But if you are just looking for lots of reliable plinking and blasting ammo, you can not beat any good progressive reloading machine.
Gregg