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All RCBS stuff has a life time guarantee. That said, and assuming you are willing to use it, there is very little between these three except price. Why such a spread? Because many believe that bigger (and more expensive) is better.
The Rock Chucker can do one thing that the others can not. It has a removable threaded screw in the top that can be removed and replaced with one that will handles REALLY big diameter dies, like those used on the 50 BMG. Oddly enough, however, some really long cartridges are too long to fit. For that you'd need another special press, the single station version of their Ammo-Master. Don't know if that is still available.
I've used almost all the of RCBS presses at one time or another. I've got a Rock Chucker because I have a few really large diameter dies. For most stuff, however, I use the Partner. Excellent little machine.
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