I'm very happy to have this Serta Mattress Pad. It's great to be able to crawl into a nice, warm bed at the end of the day. Although there are wires running internally, the mattress pad is actually more plush than I had thought it would be. My bed is much more comfortable now, even with the pad turned off. The controls are very simple and easy to figure out. They also light up, making them easily visible, even at night. The mattress pad heats up evenly and fast and it's great that there are two separate controls so that both sides may be adjusted to a certain user. The only improvement I can see were if the cords were slightly longer I would be able to hide them better. Right now they are completely visible at the end of my bed and over to the outlet. The benefits of using the mattress pad outweigh this one matter. I would recommend this to those looking for an easy-to-use and reliable mattress pad.