I have two of them, the Piggyback 2 model. (One of them was given to me.) I have loaded thousands of rounds between the two of them. One is permanently set up for .45 acp and the other rotates between 9mm .40. Get an extra shell plate then you can leave your dies in and they are already set properly, really saves time. I have had a few problems with them (primer bushing came out of one of them causing it to feed two primers at once); the spring for the powder measure didn't always work properly. Easy fixes, however. On the plus side, RCBS has an excellent warranty and a couple of springs (primer feed) that broke and a few other parts that wore out, they replaced for free after a phone call. Nice people to deal with.
Read the manual carefully and make sure everything is indexing properly before you start cranking out the rounds. If you shoot a lot of handgun ammo, this is a nice addition. (I just cranked out 750 9mm's in an afternoon that the kids blasted off at Christmas.) Just double check each case has powder in it. That might sound obvious but when you have 5 things happening at once you can lose track of what's happening.