Mine is set up for large primers. Dillon does offer the machine(RF100) in small or large primer setups. They also offer conversion kits, and you don't have to be a rhodes scholar to make the change.
I must say, with all of the negative feedback that I viewed about it, I was a little sceptical about buying one. But after buying, and using it, I can't see how anyone wouldn't be happy with it.
Slavex: The big tube is the primer tube. What I usually do is dump the primers in, hit the blue button, and forget about it. When my reloader primer alarm goes off, I pop out the RF100 tube load the primers in the primer magazine, and repeat the process again.
Hoofy: I'm enjoying mine too