When I first got this Serta heated mattress pad I wasn't really sure what to think as I hadn't heard of them before. I know about heated blankets but not mattress pads. I finally put in on the bed when it was about -20 outside and OMG, it is a life changer ever since!! It is so nice to turn it on and let the bed warm up and then just slide in and be nice and toasty. My cat Freddy loves it and would spend the whole day on it if I let him. Have nothing bad to say, my whole family loves it and all want one now for their beds!