The first night in the preheated bed - terrific. However, I had to leave the mat run twice, the first time you could not get warm. Probably a small start difficulty. Level 3 is incredibly warm, so that even the bedding is really chubby when you jump in the springs. However, one should regulate the temperature at night, because at some point you dream of that someone now does a Kräuteraufguß: o) drawback is actually the connector, looking out much under the fitted sheet. So please use a larger sheet, otherwise makes this independently and not stay on the mattress. The product = wonderful. Interressant it is still, when the first wash is pending because it consists of thin flow, which does not affect machine compatible, but since I leave me once on the advertised companies is purely guarantee!