I read a lot of reviews before taking the plunge and buying this bed. Firstly, even if you look at serta's website, you see that most beds today are not double sided and have a definite up and down. they also say that a pillow top will dip and take the sleeper's shape and that is how it is supposed to work, not signs of a cheep product. I will agree that the sides don't seem as firm, especially compared to my previous Serta. There is some motion transfer, but nothing serious. it is a very soft bed, I haven't noticed that it is particularly hard under the pillow top. We haven't had any problems with sheets fitting, either. We have had the bed for a month now and are very pleased with it. We're sleeping well and so far holding up well to heavier sleepers and all bed activities.