Has anyone used the RCBS Piggyback 3 upgrade kit ? I'm currently using a Rock Chucker and I'm quite tempted to get the kit to upgrade it to a progressive.

I have two of them.

The first two piggybacks, the Piggyback and the Piggyback II, were horrible. Just one problem after another. The Piggyback III, however, works beautifully. Excellent machine. The Piggyback III and Piggyback IV, of course, use the RCBS strip primer system. That too is excellent.