Big Kahuna is ok
I bought a Smoke Daddy Big Kahuna last year, and I've had mixed results. I have it installed on my MES/Centro 30" electric smoker for cold smoking sausage (burner in the unit doesn't smoke very well at those low temps).
The first time I used it, I got it up and running no sweat, but I left the air pump valve wide open. That allows the unit to put out the max amount of smoke, and all the chips and pellets I used were gone, and as a result my snack sticks were a little funky tasting. They're not supposed to get heavy smoke anyways, but they did in that case.
I think my smoke chamber is too small to leave the pump valve on wide open, even with the smoker vent fully open. So, what's required is some fiddling with the air flow, I've tried to get the thing set so its the minimum amount coming out of the pump to keep the smoke going. This has resulted in some poor smoke generation on some Cotto Salami (buffalo meat, yum) - another sausage that thankfully doesn't require a lot of smoke, and they turned out great. I had to go out, and couldn't sit on the thing to make sure it stayed lit.
The last experience was the best, nice smoked bacon! the Smoke Daddy worked well for this, but it did go out a couple times because I was fiddling with air flow again. Luckily I was home and was there to watch the progress.
There's a great vid on youtube of a guy using a Big Kahuna with a garbage can smoker, though the vid series is mostly about making bacon: http://www.youtube.com/watch?v=bF0NIfgSu6k