I think Hornady makes about the best and easiest except that the nozzle clogs, wasting half the can. I have been using Dillon's case lube with satisfaction also.
I''ve never had that problem, at least with the Hornady One Shot. My cans get all the way m/t, to darn fast!
I would love to understand why the imperial is so good. I have a can, but its time consuming to lube compared to all the rest. I have been using it for the mouths, but thats the only advantage I see. Maybe someone could help me understand.
The Imperial is of course better for the mouths than the RCBS goup, no chance of any excess tiny drop running down into the case. But where Imperial really shines is the heavy duty jobs. The Imperial's superior lubrosity really shows when you are either necking up or down and/or case forming, for wildcats.