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I got hold of a couple bags of RO briqs from ACE Hardware a while back. I like it much better that KingsFord, and it performs better in my drum than lump does.
I have one and it's good, but you have to modify the charcoal pan so the ash doesn't smother the fire out. I used a "grill wok" as a coal basket for a while, until I modded it again. You can see pics of my final mods via my sig below.
On my charcoal model, I used to run probe wires near the latch, but sometimes they got in the way. Later I found the gap on the hinge side of the door leaves just enough room for probe wires without getting pinched, and they're out of the way too.