I have one and it's great. First try getting it up to temp the old fashion way and see if it keeps temp. Secondly do you have enough exhaust? If you don't then that could be your problem.
Mini WSM uds style, Jumbo Mini WSM aka Jimmy, newly renovated Big Poppa Black powder coated UDS, Kettle, Potbelly Stove Smoker Smoke house w/ Smoke Daddy cold smoke generator attached.PitmasterIQ,Guru PartyQ ...Keith