I agreed that it's for sure the way to go on bullet-types. I've tried it on my small AND large offsets, but it doesn't work as well. The fire just steadily creeps up, as does the temp. Of course - this is likely due to the fact that my fireboxes aren't air tignt on either, but I don't care. I have no problem with the fact that they aren't air tight...in fact, just like with any smoker out there, once you learn YOUR equipment you can make it work for you.
For me, the point of using an offset (at least the BIG one) is to maintain a small but "lively" fire, and you can't really do fire using the minion...
However, it's GREAT for smaller charcoal smokers, and even better for charcoal grilling! Glad you find it works for you...