I searched for heated mattress pad for some time as I always found myself cold at night.    The Serta Waterproof Heated Mattress Pad does get quite warm and is very comfortable.  I have been choosing a mid-range (4-5) setting.  I also like the ability to have it automatically shut off and try to align that with the alarm.  It's nice to go to bed in a warm bed--especially in a bedroom with little insulation.  It warms up quickly and provides for even heat distribution. Love how it warms the blankets around me.  Also find that the controller wire is not as noticeable as I thought it would be.