I had one. Came with a kettle i rescued.
I used it a couple times just to see how it worked.
It worked OK. The water pan is a freaking joke, don't even bother with it. Too small to be a heatsink. Moist cooking environment? Pshaw. I don't think anyone can tell the difference between water vs no water.
It held temps ok. But really no better than fire bricks or even baskets or banking.
The advantage is how high you can stack the charcoal up the kettle wall
For the price, its not worth it unless you really plan to cook on the lower deck (beer can turkey, etc)
The cajun bandit stacker is a million times better.
(and I can make money by selling the smokenator, i don't make shit by recommending the cajun bandit. Unlike other that only recommend things that pay the bills)