I have a Smoke Daddy Big Kahuna and a 6" A-Mazen-Tube and the Tray setup.
Don't use them in a kettle, but if I did, I'd probably pound the items being smoked heavy for some time then remove the smoke generator before lighting any fuel.
I like BBCue-Z's pic with the pellets/wood chunks in the ash can. I can see myself putting a Quick release air fitting on the can and plugging in the Big Kahuna!
I figured I needed a smoke generator for my pellet poopin' WSM, after following some pellet forum complaints about some cookers weren't putting out enough smoke, but haven't found that to be an issue for me.
Basically just use them if I want to infuse flavored pellets into whatever I might be smoking. BBQ'rs Delight or Mel's Gourmet pellets are a few flavored brands I have, there are more out there.
A guy gave me a Hillbilly smoke generator, its a crude Smoke Daddy clone, but it works! I'll take some pics when I get a chance and post them in this thread.