I don't know about their mattresses, but the pillows made by Temperpedic are really really good, and I'm sure that their mattress pads ("toppers") are also, well, tops.

I've heard ~ from a friend whose family has been in the furniture biz for generations ~ that there are only a few actual manufacturers of mattresses, which means that store brands and any other "generic" choices are actually products of one of the well-known "major brand" companies, and that the quality is exactly the same regardless of what label gets sewn on.