The feeder tube is a spring much like the KISS. The mounting is adjustable for height. It comes ready to load 9mm, 38spl/357mag, 38 super, 40 cal, 44, and 45. Very simple and effective. RCBS claims no failures in any cal with a high usage count. March-April ship date. MSR $495. .223 and .308 are in the works. Very small footprint on bench-it appears that it would work with any progressive press. BTW-Dillon will offer upgrade on the RF 100. It is a replacement for the black box on the side which will have a built in switch and vibration control knob. They are currently working on instruction sheet. They will ship the part and the owner can do the swap out. They do not have a part number yet. I do not know if there will be an upgrade charge.