We are previous owners of the original Temper-Pedic, which was very warm. The cooling effect of this mattress is wonderful, especially as we are getting older. We also purchased an adjustable bed frame, which helps with comfort. The first few nights I was uncomfortable but I think it was due to being a new feeling. After the third night I have slept all night, with no backache when I wake up. I still need to find the best fitted sheets to work with the deep pockets and the mattress protector we purchased with the set, the fitteed sheet does not stay under the mattress on the sides.