The only flaw I've found on the RCBS Rock Chucker Supreme is the plastic primer catcher. It needed tapping every so often or it would clog and it would spill primers when you unsnaped it from the press to empty. I bent and shaped a piece of 1/2" OD copper tube and soldered a couple copper straps to hold it in place. I also plugged the unneeded openings with strips of high density foam to direct the strays. All the primers go into an old powder bottle.