I've had this unit running for two years in my 375 cubic foot wine room. It has been completely reliable and has maintained its temperature perfectly. I've had two minor issues. First, the humidity hovers around 50%, which is somewhat low. Second, the interior fan has blown a fair bit of very tiny paint flakes into the wine room. I cannot see where they originate, but they haven't seemed to do any harm.
Overall, I think it's a fantastic unit for a tight space. Mine is located over the cellar door and looks great too! It is a great value when you compare it feature by feature to more expensive brands...