I have the RCBS 505 and the Lyman 1200 DPS II. Both of them are consistant. The DPS is quick. I am dispensing a charge while I am seating bullets.The charges are preprogramed into the Lyman, and it's a matter of pushing a button to dispense my preselected charge. I love the power scale, and use the 505 to check my charges every once in a while. The digital scale will vary if the furnace kicks in, yes it is that sensitive. It has a plastic cover that covers the pan, and that eliminates the fluctuation, if you close it. It is very simple to operate, and I love it.