I bought this 1 week ago. I've cooked twice and I don't seem to be having the issues that others have posted. I'm having no problems regulating the temperature. 
Very experienced with a grill but this is my 1st smoker. So far I love it.
It does leak a little around the chamber door but I can hold 275°-285° with no problem. 
So far 1 tenderloin and 1 15lb brisket turned out to perfection. 
Very satisfied with the purchase of this product.