Instruct: Classify a review as either positive or negative.
Query: Very nice in the 30 days it worked

This could be a very good investment if it worked. Mine was a king size and had two separate controls, one for each side of the bed, and they can be turned on/off and adjusted independently. It had a Pre-Heat function that was wonderful, you just turn it on and press PH and went to wash your teeth, change, or whatever, and when you return to your bed in those cold nights, the bed was all warm and comfortable.But this thing just lasted about a month. Soon one of the controls began flashing "FF" and stop working. The other side was working fine for a while. That's when I began searching the Web for a solution, and found out that many, many customers have this same problem, and that, acording to them, Sunbeam has a terrible customer service department.Solution? I think is none, just stay away from it and you will be fine.